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Summary

One day, Shimizu Seiya wakes up in a hospital bed, from his little sisters he learns that he was carried there by an ambulance. As he has no memory of what happened, he asks his little sisters about it, and they answer... "Onii-chan, you had a technobreak..." A technobreak, in other words his heart malfunctioned because of a too long masturbation period, he lost consciousness and was found by his little sisters which saved his life. But the day before he was supposed to be just doing university assignments and he had no memory or intention to masturbate...! Apparently the reason for this was the high amount of energy drinks he drank in order to work overnight. The drink was studied in a laboratory and found to have included substances forbidden by law, and currently was being recovered by police. The drink caused Seiya to become extremely aroused and was unable to to stop masturbating, he continued that overnight until losing consciousness. Apparently the symptoms would eventually disappear and his body will go back to normal. Meanwhile Seiya felt relieved, his little sister gave him a certain item. "It's a chastity belt, Onii-chan." While embarrassed, his little sister continued. "At this rate you won't be able to stop to stop masturbating, so..." "We have decided that we will manage your ejaculation!" These words astounded Seiya and so, his days of having his ejaculation controlled by his cute little sisters began.

G-Cup Sisters! ~Imouto Darake no Sakunyuu Gakuensai~
G-Cup Sisters! ~Imouto Darake no Sakunyuu Gakuensai~
0%
Tags
  • Adult Breast Feeding
  • Triple Boobjob
  • Siscon Protagonist
  • Heroine with Inverted Nipples
  • Protagonist's Full Sister as a Heroine
Rating 6.6534 Users
Harami Tama
Harami Tama
0%
Tags
  • Youkai Heroine
  • Youkai
  • European Heroine
  • Defloration During Common Route
  • Tailjob
Rating 6.8530 Users
Maou no Kuse ni Namaiki da! 2 ~Kondo wa Seisen da!~
Maou no Kuse ni Namaiki da! 2 ~Kondo wa Seisen da!~
0%
Tags
  • Naga Heroine
  • Hikikomori Protagonist
  • Chuunibyou Heroine
  • Heroine With Kansai Accent
  • Kitsune Heroine
Rating 7.2454 Users
Chikan Ochi ~Shinri Counselor Meika no Shinryou Kiroku~
Chikan Ochi ~Shinri Counselor Meika no Shinryou Kiroku~
0%
Tags
  • Chikan
  • Police Officer Heroine
  • Scientist Heroine
  • Molestation on Public Transport
  • Handcuffed Sex
Rating 6.5320 Users
Koko wa Suki na Dake Sex Shite, Minna ni Yorokobareru Sekai!
Koko wa Suki na Dake Sex Shite, Minna ni Yorokobareru Sekai!
0%
Tags
  • Vaginal Gaping
  • Promiscuous Heroine
  • Sex Involving Prostitution
  • Heroine with Pubic Hair
  • Ahegao
Rating 6.4122 Users
Harem Game 2 ~Futsuu ja Nai Shujinkou ga Harem o Kizuku Fantasy (?)~
Harem Game 2 ~Futsuu ja Nai Shujinkou ga Harem o Kizuku Fantasy (?)~
0%
Tags
  • Heroine from a Different World
  • Model Heroine
  • Twincest
  • Oppai Loli Heroine
  • Unavoidable Harem Ending
Rating 6.3325 Users
Mama no Oppai ~Ore no Doutei Milk ga Shiboritorareta Ken~
Mama no Oppai ~Ore no Doutei Milk ga Shiboritorareta Ken~
0%
Tags
  • All Older Heroines
  • Blood-related Aunt/Nephew Incest
  • Breast Smothering
  • Protagonist's Aunt as a Heroine
  • Non-blood-related Mother/Son Incest
Rating 6.8357 Users
Ore ni Kanojo ga Dekite kara Imouto-tachi no Yousu ga Okashii!?
Ore ni Kanojo ga Dekite kara Imouto-tachi no Yousu ga Okashii!?
0%
Tags
  • All Younger Heroines
  • All Heroines are Protagonist's Sister(s)
  • Brother/Sister Incest
  • Baker Protagonist
  • Brother/Sister Romance
Rating 6.4023 Users
Kenja no Okuri Imouto
Kenja no Okuri Imouto
0%
Tags
  • Non-twin Heroine Sisters
  • All Heroines are Protagonist's Sister(s)
  • Siscon Protagonist
  • Brother/Sister Incest
  • Masochist Protagonist
Rating 6.6956 Users
Yu no Mura Harem ~Kyonyuu Haramase Onsen Taizai Ki~
Yu no Mura Harem ~Kyonyuu Haramase Onsen Taizai Ki~
0%
Tags
  • Farmer Heroine
  • All Adult Heroines
  • Twin Buttjob
  • Cousin Incest
  • Adult Breast Feeding
Rating 6.7828 Users
Aneimo Neo+ ~Second Sisters~
Aneimo Neo+ ~Second Sisters~
0%
Tags
  • Non-blood-related Mother/Son Incest
  • Romancing a Family
  • Sex with Protagonist Only
  • Martial Artist Protagonist
  • Pillow Talk
Rating 7.0854 Users
Yuri Killer In
Yuri Killer In'yoku ni Ochiru Yuri-tachi
0%
Tags
  • P.E. Teacher Heroine
  • Hotblooded Protagonist
  • Principal Heroine
  • Narrating Others' Thoughts
  • Pretending Heroine
Rating 6.6926 Users
Kyonyuu Onsen Kozukuri no Yu ~Yama no Naka no Hitou de Deatta no wa Bijin Oyako Deshita~
Kyonyuu Onsen Kozukuri no Yu ~Yama no Naka no Hitou de Deatta no wa Bijin Oyako Deshita~
0%
Tags
  • Oyakodon
  • Student Council
  • Heroine's Mother as a Heroine
  • Onsen
  • Impregnation
Rating 6.2021 Users
Jusei Shite yo Chizuru-san! ~Hitozuma to Koi Suru Hitonatsu~
Jusei Shite yo Chizuru-san! ~Hitozuma to Koi Suru Hitonatsu~
0%
Tags
  • Discreet Phone Sex
  • French Kiss
  • Oneesan-type Heroine
  • Excessive Semen
  • Only a Single Heroine
Rating 6.6244 Users
Aozora Stripe
Aozora Stripe
0%
Tags
  • Cook Protagonist
  • Panchira
  • Charming Protagonist
  • Serious Protagonist
  • Beach
Rating 7.2681 Users
Gokkun Athlete! Kyonyuu Medalist no Oshaburi Kyouka Gasshuku
Gokkun Athlete! Kyonyuu Medalist no Oshaburi Kyouka Gasshuku
0%
Tags
  • Clothing ON/OFF
  • Athlete Heroine
  • Athletics Festival
  • Heroine with Tan Lines
  • Protagonist's Older Sister as a Heroine
Rating 6.8959 Users
Harem Mura ~Dousotsu Fukahi! Kodane Teikyou wa Mura no Okite Desu!!~
Harem Mura ~Dousotsu Fukahi! Kodane Teikyou wa Mura no Okite Desu!!~
0%
Tags
  • Unavoidable Harem Ending
  • Stranded
  • Protagonist's Twin as a Heroine
  • Sex Under the Necessity
  • Sexual Slavery (Consensual)
Rating 6.5024 Users
Uruwashi no Seimegami Cecil o Sukuu Nakadashi Shinkon Seikatsu! ~Amaete Ii kara... Anata no Kodane o Takusan Shikyuu ni Sosoide?~
Uruwashi no Seimegami Cecil o Sukuu Nakadashi Shinkon Seikatsu! ~Amaete Ii kara... Anata no Kodane o Takusan Shikyuu ni Sosoide?~
0%
Tags
  • Goddess Heroine
  • Heroine with Sport Bloomers
  • Single Ending
  • Linear Plot
  • Cosplay
Rating 6.2220 Users
Yuuwaku Kazoku Ecchi ~Mama to Imouto-tachi no Amai Onedari~
Yuuwaku Kazoku Ecchi ~Mama to Imouto-tachi no Amai Onedari~
0%
Tags
  • Blood-related Mother/Son Incest
  • Mother/Son Romance
  • Protagonist's Blood-related Mother as a Heroine
  • Non-twin Heroine Sisters
  • Protagonist's Full Sister as a Heroine
Rating 6.3421 Users
Love Tore ~Ecchi na Ren
Love Tore ~Ecchi na Ren'ai Training~
0%
Tags
  • Triple+ Buttjob
  • Heroine with Huge Breasts
  • Nursing Handjob
  • Triple Boobjob
  • No Virgin Heroines
Rating 7.1752 Users
Henshin!
Henshin!
0%
Tags
  • Anthropomorphized Inanimate Object
  • Shapeshifting
  • Crippled Heroine
  • Pubic Hair Option
  • Albino Heroine
Rating 6.3529 Users
Grimoire no Shisho
Grimoire no Shisho
0%
Tags
  • Mage Protagonist
  • Energy Transfer via Sex
  • Magic/ESP Combat
  • Nun Heroine
  • Thief Heroine
Rating 6.8440 Users
Boku no xx wa Ryousei-tachi no Tokken Desu!
Boku no xx wa Ryousei-tachi no Tokken Desu!
0%
Tags
  • Dormitory Manager Protagonist
  • Sprite Filter
  • School Sports Club Member Heroine
  • Protagonist with Phimosis
  • Defloration During Common Route
Rating 6.5731 Users
Tsuboi-kun no Switch!
Tsuboi-kun no Switch!
0%
Tags
  • Shota Protagonist
  • Non-blood-related Mother/Son Incest
  • Protagonist's Non-blood-related Mother as a Heroine
  • Pegging
  • Penile Masturbation
Rating 6.9052 Users
Tokonatsu Shimai Sand
Tokonatsu Shimai Sand
53%
Tags
  • All Heroines are Protagonist's Sister(s)
  • Protagonist's Older Sister as a Heroine
  • Androphobic Heroine
  • Protagonist's Twin as a Heroine
  • Bunnygirl Cosplay
Rating 6.5632 Users
Koakuma Hatsuiku Chu~!
Koakuma Hatsuiku Chu~!
50%
Tags
  • All Younger Heroines
  • Submissive Protagonist
  • Imouto-type Heroine
  • Loli Support Character
  • Protagonist's Cousin as a Heroine
Rating 6.6523 Users
Tamahaji! -Tamatama Hajikeru Imouto-tachi-
Tamahaji! -Tamatama Hajikeru Imouto-tachi-
42%
Tags
  • In Medias Res
  • All Heroines are Protagonist's Sister(s)
  • Multiple Defloration
  • Homecoming
  • Brother/Sister Romance
Rating 6.7532 Users
Mazomai ~M na Imouto no Ecchi na Onedari~
Mazomai ~M na Imouto no Ecchi na Onedari~
42%
Tags
  • All Heroines are Protagonist's Sister(s)
  • Harem Ending with Theme
  • Siscon Protagonist
  • Brocon Heroine
  • Homemaker Protagonist
Rating 6.5929 Users
Chu Shite Agechau ~Oshikake Onee-san no Seikou Chiryou~
Chu Shite Agechau ~Oshikake Onee-san no Seikou Chiryou~
40%
Tags
  • Illness
  • Medical Doctor Heroine
  • Group Sex of Several Females
  • Triple Blowjob
  • Long Sexual Scenes
Rating 6.5830 Users
Natsu Doki!
Natsu Doki!
39%
Tags
  • Heroine with a Sundress
  • Sunflowers
  • Nude Filter
  • Maid Support Character
  • Defloration During Common Route
Rating 6.6723 Users
Hani Tsuma Hs ~After Wedding~
Hani Tsuma Hs ~After Wedding~
38%
Tags
  • Sex with Protagonist Only
  • Deredere Heroine
  • Cousin Romance
  • Student-Teacher Romance
  • Class President Heroine
Rating 6.8220 Users
Aku Yome! Akuma na Yome ni Shiborareru
Aku Yome! Akuma na Yome ni Shiborareru
37%
Tags
  • Incubus Protaganist
  • Defloration During Common Route
  • Oni Heroine
  • Werewolf Heroine
  • Polygamy
Rating 6.7436 Users
Chu x Pet
Chu x Pet
36%
Tags
  • Twin Buttjob
  • Brocon Heroine
  • Protagonist's Older Sister as a Heroine
  • Student Council President Protagonist
  • Kneepit Sex
Rating 7.0155 Users
Toshishita Gentei Nuki x2 Share-house ~Shiborare Kyoudou Seikatsu~
Toshishita Gentei Nuki x2 Share-house ~Shiborare Kyoudou Seikatsu~
35%
Tags
  • All Younger Heroines
  • Heroine with Huge Breasts
  • Dormitory Manager Protagonist
  • Masochist Protagonist
  • Onahole
Rating 6.4022 Users
Otosareta Bishimai ~Douka Sono Ko Dake wa Tasukete Kudasai~
Otosareta Bishimai ~Douka Sono Ko Dake wa Tasukete Kudasai~
35%
Tags
  • Janitor Protagonist
  • Consensual Phone Sex
  • Heroine in Relationship with Other(s)
  • Defloration by Others
  • Shimaidon
Rating 6.6936 Users
Koinaka Lovers
Koinaka Lovers
35%
Tags
  • Countryside
  • High School Student Heroine
  • Male Protagonist
  • Sexual Content
  • Protagonist with a Face
Rating 6.5021 Users
Musuko no Musuko wa Dare no Mono!? ~Musuko Soudatsu Haha Imouto Sensen~
Musuko no Musuko wa Dare no Mono!? ~Musuko Soudatsu Haha Imouto Sensen~
34%
Tags
  • Mother/Son Romance
  • Blood-related Mother/Daughter Incest
  • Widow Heroine
  • Protagonist's Blood-related Mother as a Heroine
  • Oyakodon
Rating 6.3931 Users
Eigyoubu Dai 4 Ka Mesubuta Choukyou Shiiku Gakari
Eigyoubu Dai 4 Ka Mesubuta Choukyou Shiiku Gakari
34%
Tags
  • Sexual Slavery (Choukyou Variation)
  • Chubby Protagonist
  • Skip Scenes
  • Public Masturbation
  • Kidnapping
Rating 6.3728 Users
Oshirikko Venus 2
Oshirikko Venus 2
33%
Tags
  • Non-penetrative Sex
  • Big Ass Heroine
  • Buttjob
  • Perverted Protagonist
  • Heroine with Garter Belt
Rating 6.6526 Users
Hani Tsuma
Hani Tsuma
33%
Tags
  • Protagonist's Employee as a Heroine
  • Sex with Protagonist Only
  • Protagonist's Fiancee as a Heroine
  • Cousin Romance
  • Sexual Fantasizing
Rating 6.9934 Users
Migawari Inkou Seikatsu ~Shin
Migawari Inkou Seikatsu ~Shin'yuu o Mamoru Tame, Gedou Kyoushi no Iinari ni Naru Yuutousei "Ema"~
32%
Tags
  • Evil Route
  • Villainous Protagonist
  • Teacher Protagonist
  • Blackmail
  • Clothed Male Naked Female
Rating 6.4326 Users
Bakunyuu Hitozuma Maid ~Iyasare Mama Haramase no Yakata~
Bakunyuu Hitozuma Maid ~Iyasare Mama Haramase no Yakata~
32%
Tags
  • Heroine with Gigantic Breasts
  • Non-blood-related Mother/Son Incest
  • All Adult Heroines
  • Pubic Hair Option
  • Heroine with Kimono
Rating 6.5621 Users
Idol Pafupafu Management -Geinou Musume o H ni Bust UP Producer-
Idol Pafupafu Management -Geinou Musume o H ni Bust UP Producer-
32%
Tags
  • Japanese Idols
  • Dying Protagonist
  • Nursing Handjob
  • Breast Expansion
  • Chuunibyou Heroine
Rating 6.5830 Users
Bikyaku Reijou Yuuna "Ashi mo Oshiri mo Konna ni Yogosu Nante... Zettaini Yurusanai!"
Bikyaku Reijou Yuuna "Ashi mo Oshiri mo Konna ni Yogosu Nante... Zettaini Yurusanai!"
31%
Tags
  • Butler Protagonist
  • Arrogant Heroine
  • Protagonist's Boss as a Heroine
  • Heroine with Tights
  • Master and Servant
Rating 6.7327 Users
Himitsu no Itazura ~Kazoku ga Amari ni mo Miryokuteki nano de Kossori xx Shite Miru Koto ni Shimashita~
Himitsu no Itazura ~Kazoku ga Amari ni mo Miryokuteki nano de Kossori xx Shite Miru Koto ni Shimashita~
31%
Tags
  • Sex with Sleepers
  • Protagonist's Blood-related Mother as a Heroine
  • Protagonist's Full Sister as a Heroine
  • Rape Involving Drugs
  • Protagonist's Younger Sister as a Heroine
Rating 6.1927 Users
Juku Volley ~Shigoki Shigokareru Ureta Hitozuma-tachi~
Juku Volley ~Shigoki Shigokareru Ureta Hitozuma-tachi~
31%
Tags
  • Volleyball Club
  • Sports
  • Triple Boobjob
  • Fictional Modern Day Japanese Countryside
  • Bunnygirl Cosplay
Rating 6.7025 Users
Saimin Paranoia
Saimin Paranoia
30%
Tags
  • Chikan Protagonist
  • Molestation on Public Transport
  • Erotic Mind Control
  • Sex in a Vehicle
  • More Than Seven Heroines
Rating 6.3923 Users
Enkou Girls Collection ~Oyaji no Natsu wa Suzushii Loveho de Pakopako Hen~
Enkou Girls Collection ~Oyaji no Natsu wa Suzushii Loveho de Pakopako Hen~
30%
Tags
  • Prostitution
  • Prostitute Heroine
  • Sex Involving Prostitution
  • Blood-related Uncle/Niece Incest
  • Oyaji Protagonist
Rating 6.4932 Users

Onii-chan!! Shasei no Kanri wa Imouto ni Makasete!! has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
A novel needs atleast 20 owners before it's similarity is calculated.

Tags (74 total)

NameScoreImportanceWeight
Quadruple+ Blowjob2.003.056.10
Forbidden Love3.001.695.07
Brother/Sister Romance3.001.624.86
Protagonist's Full Sister as a Heroine3.001.514.52
Clothed Female Naked Male2.002.234.46
Heroine with Big Breasts3.001.484.43
Sex on a Beach2.002.174.35
Protagonist's Younger Sister as a Heroine3.001.384.13
Protagonist's Non-blood-related Sister as a Heroine2.501.634.07
Brother/Sister Incest2.001.993.97
Under the Same Roof3.001.303.91
Sex on Toilet2.001.913.82
Wake-up Sex2.001.883.76
No Opening Movie2.001.873.75
Love Hotel2.001.863.73
Mutual Masturbation2.001.753.49
Reverse Missionary2.001.673.34
Twin Boobjob2.001.673.34
Discreet Sex2.001.663.32
Excessive Semen2.001.653.31
University Student Protagonist2.001.653.30
Non-blood-related Brother/Sister Incest2.001.653.30
Facesitting2.001.653.29
Production of Pornography (Amateur)2.001.623.24
Piledriver2.001.593.18
Pissing2.001.583.16
Ejaculation Choice2.001.553.10
Deepthroat2.001.543.08
Sexual Blindfold2.001.513.01
Spoons2.001.503.00
Intercrural Sex2.001.492.99
Vaginal Fingering2.001.422.84
Blood-related Brother/Sister Incest2.001.422.83
Sex in Water2.001.382.76
Harem Ending2.001.362.72
Anal Toys2.001.342.67
Reverse Cowgirl2.001.302.60
Sounds of Copulation2.001.282.56
Female Ejaculation2.001.272.55
Bathroom Sex2.001.202.41
Student Protagonist2.001.162.32
Other Perspectives2.001.162.32
Pissing on Others1.002.292.29
Bukkake2.001.142.28
Only Virgin Heroines2.001.132.27
Multiple Penetration2.001.132.26
Quickie Fix Position2.001.122.23
Vibrators2.001.102.20
Naked Sprites2.001.052.11
Sex in Public Places2.001.052.11
Sitting Sex2.001.042.08
Standing Sex2.001.042.08
Sixty-nine2.001.042.08
Bondage2.001.012.02
Outdoor Sex2.000.961.92
Missionary Position2.000.931.87
Cunnilingus2.000.921.83
Voice Replay2.000.911.82
Group Sex of One Male and Several Females2.000.881.75
Single Footjob1.001.741.74
High School Student Heroine2.000.871.74
Cowgirl2.000.811.62
Vaginal Masturbation1.001.521.52
Doggy Style2.000.761.52
Background Moans1.001.501.50
Single Handjob1.001.421.42
Multiple Endings2.000.691.37
Anal Sex1.001.331.33
Single Boobjob1.001.301.30
Nukige2.000.621.25
Single Blowjob1.001.071.07
Male Protagonist3.000.330.99
Sexual Content2.000.450.90
ADV2.000.250.50

Traits (90 total)

NameCharactersImportanceWeight
Non-blood-related Incest Engages in (Sexual)22.202.41
Non-blood-related Sister Role22.162.37
Emotional Personality22.102.30
Off-The-Shoulder Sweater Clothes13.092.15
Observant Personality13.062.12
Big Breasts Body31.482.05
Chastity Belt Clothes12.942.04
Cooking Engages in31.421.97
Gyaru Clothes12.821.96
Teal Eyes21.681.84
Friendly Personality31.271.76
Non-blood-related Brother Role12.461.71
Miniskirt Clothes41.041.68
Whimsical Personality12.421.68
Modern Tsundere Personality12.401.67
Fainting Subject of12.381.65
Nightgown Clothes12.381.65
Pissing on Others Engages in (Sexual)12.361.64
Incest Engages in (Sexual)21.491.63
Seduction Engages in12.351.63
Younger Sister Role21.441.59
V Bangs Hair21.431.57
Shirt Clothes31.131.57
Big Ass Body12.231.55
Pissing Subject of (Sexual)12.231.54
Being Drugged Subject of12.221.54
Reading Engages in12.181.51
Average Height Body50.841.51
Body Ribbon Clothes12.161.50
Hospitalization Subject of12.161.49
Kind Personality31.081.49
Assertive Personality12.111.46
Brocon Personality12.041.42
Waitstaff Uniform Clothes12.031.41
Huge Breasts Body12.021.40
Jealous Personality12.011.39
Ahoge Hair21.261.39
Low Self-esteem Personality12.001.39
Decorative Belt Clothes11.981.37
Full Brother Role11.981.37
Sidehair Hair30.971.35
Classmate Role21.221.34
Part-time Worker Role11.931.34
Confident Personality11.841.28
Reserved Personality11.771.23
Older Brother Role11.771.23
Schoolmate Role11.751.21
High School Student Role40.751.20
University Student Role11.721.19
Side Tail Hair11.721.19
Ore Personality11.671.16
Shy Personality11.621.12
Pink Eyes11.611.12
Carefree Personality11.601.11
Ribbon Hair Accessory Clothes11.581.09
Full Sister Role11.581.09
Older Sister Role11.561.08
Teasing Engages in11.541.07
Straight Hair20.971.06
Serious Personality11.531.06
Necklace Clothes11.501.04
Sailor School Uniform Clothes11.501.04
Orange Hair11.491.03
Tank Top Clothes11.451.01
Bikini Clothes11.451.00
Pissing Engages in (Sexual)11.441.00
Slim Body50.530.95
Tsurime Eyes11.350.93
Wavy Hair11.350.93
Knee-high Socks Clothes11.320.91
Pink Hair11.310.91
Curtained Hair11.260.87
Waist Length+ Hair20.760.83
Ribbon Tie Clothes11.190.83
Long Hair20.740.81
Blue Hair11.150.80
Teen Body30.570.79
Parted to Side Hair11.110.77
Ponytail Hair11.080.75
Twin Tails Hair11.080.75
Tareme Eyes11.040.72
Amber Eyes11.010.70
School Uniform Clothes20.630.69
Pale Body50.390.69
Short Hair20.600.66
Shoulder-length Hair10.910.63
Blond Hair10.880.61
Black Hair10.840.58
Young-adult Body10.780.54
Brown Hair10.670.47