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Summary

The protagonist, Nagasawa Ikki, has a little sister named Nagasawa Mao. She's in a bit of a difficult phase of puberty. Mao is reliable, cheerful, openhearted, excels at her studies, and is a perfect superwoman! Ikki always gets treated strictly by his little sister, and even if he is her older brother, he's completely outclassed by Mao. One day, as usual, Ikki is nearly late for school, and was struck by Mao to wake him up. While complaining, he went with his little sister and rode a crowded train together to avoid being late. The train was jam packed, which resulted to them sticking together and unable to move. At that time, whether its a coincidence or a prank from God, the train shook which caused Mao's breast to push into her brother. Even if she is his little sister, Mao is a beauty who is around his age, and as such, he started acting strange and was getting aroused. Mao noticed Ikki's change in behavior and said "Could it be that you got aroused?". Ikki was unable to answer, and with a devilish smile, Mao said "I'm your little sister, you know?". And then she reached her hand towards her brother's "swelled thing"...... [Translated from Official Site]

Mebae
Mebae
NAN%
Tags
  • Protagonist with Phimosis
  • Perverted Protagonist
  • Inbreeding
  • School Sports Club Member Heroine
  • Condoms
Rating 7.3083 Users
Lilith-Izm05 ~Tairyou Shasei Hen~
Lilith-Izm05 ~Tairyou Shasei Hen~
NAN%
Tags
  • P.E. Teacher Heroine
  • Anthology
  • Half-Japanese Heroine
  • Unavoidable Rape
  • Mindbreak
Rating 6.2825 Users
Chu x Chu Paradise ~Encore Live~
Chu x Chu Paradise ~Encore Live~
NAN%
Tags
  • Twin Bellyjob
  • Alternate Dimensions
  • Japanese Idols
  • Vampire Heroine
  • Elf Heroine
Rating 7.2129 Users
♥ri no Hentai Nikki ~Chijo ni Naritai Onna no Ko~
♥ri no Hentai Nikki ~Chijo ni Naritai Onna no Ko~
NAN%
Tags
  • Chikan Heroine
  • Only Loli Heroines
  • Nympho Heroine
  • Exhibitionism
  • Consensual Group Sex of One Female and Several Males
Rating 6.2630 Users
Ookami Shoujo Reona -Yasei Houkai Hakuchi Kyouiku-
Ookami Shoujo Reona -Yasei Houkai Hakuchi Kyouiku-
NAN%
Tags
  • Rapist Protagonist
  • Internal Exhibition of Sex
  • Central Heroine
  • Sexual Devices
  • Object Insertion
Rating 6.6620 Users
Kansen 4 ~The Day After~
Kansen 4 ~The Day After~
NAN%
Tags
  • Epidemic
  • Fictional Modern Day Japanese Countryside
  • Illness
  • Desperation
  • Netorare Type B
Rating 6.4549 Users
Kodomo no Himitsu
Kodomo no Himitsu
NAN%
Tags
  • Elementary School
  • Elementary School Student Heroine
  • Student-Teacher Romance
  • Sex Involving Children
  • Shota Support Character
Rating 6.3120 Users
Iede Kissa ~Anata no Booth de Kasegasete~
Iede Kissa ~Anata no Booth de Kasegasete~
NAN%
Tags
  • Prostitute Protagonist
  • Runaway Heroine
  • Prostitution
  • Sex Involving Prostitution
  • Cafe
Rating 6.7122 Users
Netori Shugisha no Hanayome Ijiri! ~Kon
Netori Shugisha no Hanayome Ijiri! ~Kon'yakusha ga Anna Koe de Aegu no o Aniki wa Shiranai~
NAN%
Tags
  • Protagonist's Sister-in-Law as a Heroine
  • Netori
  • Female Protagonist for a Short Time
  • Blackmail
  • High Amounts of Rape
Rating 6.2021 Users
Hatsujou Saimin Appli ~Shikyuu ni Todoku Chakushin
Hatsujou Saimin Appli ~Shikyuu ni Todoku Chakushin'on~
NAN%
Tags
  • Erotic Mind Control
  • Mind Control
  • Genius Heroine
  • Double Handjob
  • Perverted Heroine
Rating 6.0420 Users
Imouto Pet ~Repure~
Imouto Pet ~Repure~
NAN%
Tags
  • Elementary School Student Heroine
  • Voiced Narration
  • Deredere Heroine
  • Brocon Heroine
  • Heroine with Spats
Rating 6.7837 Users
Binkan Athlete "So, Soko Dame! ...Oshio Fuichau!"
Binkan Athlete "So, Soko Dame! ...Oshio Fuichau!"
NAN%
Tags
  • Figure Skater Heroine
  • Sports
  • Massage Therapist Protagonist
  • Athlete Heroine
  • Fingering
Rating 6.7925 Users
Sacred†Vampire -Sacred Vampire-
Sacred†Vampire -Sacred Vampire-
NAN%
Tags
  • Vampire
  • Religious Heroine
  • Vampire Protagonist
  • Heroine with Heterochromia
  • Clumsy Heroine
Rating 6.5321 Users
Hatsujou Inbo ~Uzuku Jukutai wa, Sono Yokujou o Osaekirenai~
Hatsujou Inbo ~Uzuku Jukutai wa, Sono Yokujou o Osaekirenai~
NAN%
Tags
  • Daughter Support Character
  • Quickie
  • Clothed Female Naked Male
  • Protagonist's Non-blood-related Mother as a Heroine
  • Onsen
Rating 5.8629 Users
Demiparadoxia ∞ Hookerstic - Nanka Hen
Demiparadoxia ∞ Hookerstic - Nanka Hen
NAN%
Tags
  • Prostitute Heroine
  • Pubic Hair Option
  • Hotel
  • Customization
  • Sex Involving Prostitution
Rating 6.1828 Users
Akatoki 2! -Tsumugu Mahou to Koboreru Hikari-
Akatoki 2! -Tsumugu Mahou to Koboreru Hikari-
NAN%
Tags
  • Strip Game
  • Turn-Based Strategy
  • Clothing Damage
  • Naizuri
  • Combat Capable Friends
Rating 7.1625 Users
Dungeon Crusaderz ~Tales of Demon Eater~
Dungeon Crusaderz ~Tales of Demon Eater~
NAN%
Tags
  • Dungeon Crawling Game
  • Action
  • RPG
  • Twin Footjob
  • Past
Rating 6.5928 Users
Ai Suru Tsuma ga Me no Mae de Tanin Bou ni Tsuranukare, Yogari Aeide Iku. Gomennasai Anata. Demo, Watashi Kimochi Ii no...
Ai Suru Tsuma ga Me no Mae de Tanin Bou ni Tsuranukare, Yogari Aeide Iku. Gomennasai Anata. Demo, Watashi Kimochi Ii no...
NAN%
Tags
  • Nameable Heroine(s)
  • Female Protagonist for a Short Time
  • Confinement
  • Protagonist in Relationship
  • Married Heroine
Rating 6.3241 Users
Yukiuta
Yukiuta
NAN%
Tags
  • Boke Protagonist
  • Blind Heroine
  • Yakuza
  • Late Sexual Content
  • Non-blood-related Brother/Sister Incest
Rating 6.8733 Users
Osananajimi ga Chichioya to Dekiteita Ken ni Tsuite ~Oyaji kara no Shuuchi Netori Choukyou~
Osananajimi ga Chichioya to Dekiteita Ken ni Tsuite ~Oyaji kara no Shuuchi Netori Choukyou~
NAN%
Tags
  • Clinical Depression
  • Heroine in Relationship with Other(s)
  • Blackmail
  • Netori
  • Remote-controlled Vibrator
Rating 6.5725 Users
Dungeon Crusaderz 2 ~Eigou no Rakudo~
Dungeon Crusaderz 2 ~Eigou no Rakudo~
NAN%
Tags
  • Mages Association
  • Straight Shotacon
  • RPG
  • Dungeon Crawling Game
  • Customization
Rating 7.1430 Users
Koitsura Erosugi!
Koitsura Erosugi!
NAN%
Tags
  • Heroine with Tan Lines
  • Protagonist's Younger Sister as a Heroine
  • Protagonist's Full Sister as a Heroine
  • Protagonist with Phimosis
  • Mesugaki Heroine
Rating 6.0222 Users
Stopping!!! 8: Sexy Body Tankentai
Stopping!!! 8: Sexy Body Tankentai
NAN%
Tags
  • Time Stop
  • Ugly Protagonist
  • Chubby Protagonist
  • Unavoidable Rape
  • Flat Tints Only
Rating 6.3920 Users
Kyonyuu Seido Kaichou Chijoku no Hakudaku Kuro Tights ~Konna Yatsu no Okazu ni Naru nante!~
Kyonyuu Seido Kaichou Chijoku no Hakudaku Kuro Tights ~Konna Yatsu no Okazu ni Naru nante!~
NAN%
Tags
  • Student Council President Protagonist
  • Skip Scenes
  • Built-in Flowchart
  • Peace Sign Ahegao
  • Blowjob Duck Face
Rating 6.4431 Users
Papa to Namaiki Musume no Saimin Soukan ~Tsuma ni wa Himitsu no Shitsukekata~
Papa to Namaiki Musume no Saimin Soukan ~Tsuma ni wa Himitsu no Shitsukekata~
50%
Tags
  • Protagonist's Blood-related Daughter as a Heroine
  • Blood-related Father/Daughter Incest
  • Erotic Mind Control
  • Protagonist with Children
  • Only Blood-related Heroines
Rating 6.0122 Users
Fukubiki! Triangle
Fukubiki! Triangle
33%
Tags
  • Comedic Love Triangle
  • Energetic Heroine
  • Protagonist's Senpai as a Heroine
  • Protagonist's Kouhai as a Heroine
  • Internal Exhibition of Sex
Rating 7.0822 Users
Hatsujou Inbo ~Uzuku Jukutai wa, Sono Yokujou o Osaekirenai~
Hatsujou Inbo ~Uzuku Jukutai wa, Sono Yokujou o Osaekirenai~
32%
Tags
  • Daughter Support Character
  • Quickie
  • Clothed Female Naked Male
  • Protagonist's Non-blood-related Mother as a Heroine
  • Onsen
Rating 5.8629 Users
Sacred†Vampire -Sacred Vampire-
Sacred†Vampire -Sacred Vampire-
32%
Tags
  • Vampire
  • Religious Heroine
  • Vampire Protagonist
  • Heroine with Heterochromia
  • Clumsy Heroine
Rating 6.5321 Users
Binkan Athlete "So, Soko Dame! ...Oshio Fuichau!"
Binkan Athlete "So, Soko Dame! ...Oshio Fuichau!"
31%
Tags
  • Figure Skater Heroine
  • Sports
  • Massage Therapist Protagonist
  • Athlete Heroine
  • Fingering
Rating 6.7925 Users
Hatsujou Saimin Appli ~Shikyuu ni Todoku Chakushin
Hatsujou Saimin Appli ~Shikyuu ni Todoku Chakushin'on~
29%
Tags
  • Erotic Mind Control
  • Mind Control
  • Genius Heroine
  • Double Handjob
  • Perverted Heroine
Rating 6.0420 Users
Imouto Pet ~Repure~
Imouto Pet ~Repure~
27%
Tags
  • Elementary School Student Heroine
  • Voiced Narration
  • Deredere Heroine
  • Brocon Heroine
  • Heroine with Spats
Rating 6.7837 Users
Iede Kissa ~Anata no Booth de Kasegasete~
Iede Kissa ~Anata no Booth de Kasegasete~
27%
Tags
  • Prostitute Protagonist
  • Runaway Heroine
  • Prostitution
  • Sex Involving Prostitution
  • Cafe
Rating 6.7122 Users
Netori Shugisha no Hanayome Ijiri! ~Kon
Netori Shugisha no Hanayome Ijiri! ~Kon'yakusha ga Anna Koe de Aegu no o Aniki wa Shiranai~
27%
Tags
  • Protagonist's Sister-in-Law as a Heroine
  • Netori
  • Female Protagonist for a Short Time
  • Blackmail
  • High Amounts of Rape
Rating 6.2021 Users
Akatoki 2! -Tsumugu Mahou to Koboreru Hikari-
Akatoki 2! -Tsumugu Mahou to Koboreru Hikari-
27%
Tags
  • Strip Game
  • Turn-Based Strategy
  • Clothing Damage
  • Naizuri
  • Combat Capable Friends
Rating 7.1625 Users
Ai Suru Tsuma ga Me no Mae de Tanin Bou ni Tsuranukare, Yogari Aeide Iku. Gomennasai Anata. Demo, Watashi Kimochi Ii no...
Ai Suru Tsuma ga Me no Mae de Tanin Bou ni Tsuranukare, Yogari Aeide Iku. Gomennasai Anata. Demo, Watashi Kimochi Ii no...
26%
Tags
  • Nameable Heroine(s)
  • Female Protagonist for a Short Time
  • Confinement
  • Protagonist in Relationship
  • Married Heroine
Rating 6.3241 Users
Osananajimi ga Chichioya to Dekiteita Ken ni Tsuite ~Oyaji kara no Shuuchi Netori Choukyou~
Osananajimi ga Chichioya to Dekiteita Ken ni Tsuite ~Oyaji kara no Shuuchi Netori Choukyou~
25%
Tags
  • Clinical Depression
  • Heroine in Relationship with Other(s)
  • Blackmail
  • Netori
  • Remote-controlled Vibrator
Rating 6.5725 Users
Koitsura Erosugi!
Koitsura Erosugi!
25%
Tags
  • Heroine with Tan Lines
  • Protagonist's Younger Sister as a Heroine
  • Protagonist's Full Sister as a Heroine
  • Protagonist with Phimosis
  • Mesugaki Heroine
Rating 6.0222 Users
Kyonyuu Seido Kaichou Chijoku no Hakudaku Kuro Tights ~Konna Yatsu no Okazu ni Naru nante!~
Kyonyuu Seido Kaichou Chijoku no Hakudaku Kuro Tights ~Konna Yatsu no Okazu ni Naru nante!~
25%
Tags
  • Student Council President Protagonist
  • Skip Scenes
  • Built-in Flowchart
  • Peace Sign Ahegao
  • Blowjob Duck Face
Rating 6.4431 Users
Alter Ego
Alter Ego
24%
Tags
  • Simulation Game
  • SRPG
  • Oneesan-type Heroine
  • Protagonist's Senpai as a Heroine
  • Protagonist's Kouhai as a Heroine
Rating 6.7120 Users
Ai Suru Tsuma, Nagisa no Uwaki Kokuhaku Okuyukashii Tsuma no Karada ga, Aitsu no Geki Piston de Torokete Ita Shinjitsu
Ai Suru Tsuma, Nagisa no Uwaki Kokuhaku Okuyukashii Tsuma no Karada ga, Aitsu no Geki Piston de Torokete Ita Shinjitsu
24%
Tags
  • Glasses Option
  • Unavoidable Netorare
  • Netorare Type A
  • Married Heroine
  • Kissing Scene
Rating 6.7128 Users
Oni Chichi After ~Nure Suke Airi to Amayadori Hen~
Oni Chichi After ~Nure Suke Airi to Amayadori Hen~
24%
Tags
  • Non-blood-related Father/Daughter Incest
  • Only Protagonist's Relatives as Heroine(s)
  • Rain
  • Half-Japanese Heroine
  • Only Younger Heroines
Rating 6.0422 Users
Omae no Mama o Share Shiyou ze ~Musuko e no Ijimekko-tachi ni Otosareru Bibo~
Omae no Mama o Share Shiyou ze ~Musuko e no Ijimekko-tachi ni Otosareru Bibo~
24%
Tags
  • Netorase
  • Mother/Son Incest
  • Fisting
  • Blood-related Incest
  • Pregnancy Bad Ending
Rating 6.3628 Users
Chu x Chu Idol 2 -Melodies x Memories-
Chu x Chu Idol 2 -Melodies x Memories-
23%
Tags
  • Vampire Heroine
  • Idol Heroine
  • Musical Environment
  • Japanese Idols
  • Heroine with Heterochromia
Rating 7.3125 Users
Imouto Ninshin
Imouto Ninshin
23%
Tags
  • Inbreeding
  • Only Blood-related Heroines
  • Only Protagonist's Sisters as Heroine(s)
  • Only Younger Heroines
  • Impregnation
Rating 5.5822 Users
Zetsurin Yandere Haha ~Musuko no Kyokonburi ni Teisou ga Yoromeku~
Zetsurin Yandere Haha ~Musuko no Kyokonburi ni Teisou ga Yoromeku~
23%
Tags
  • Protagonist's Son as a Hero
  • Mother/Son Romance
  • Only Younger Heroes
  • Yamato Nadeshiko Protagonist
  • Forbidden Love
Rating 6.2127 Users
D-EVE in you
D-EVE in you
23%
Tags
  • Japanese Idols
  • Idol Heroine
  • Singer Heroine
  • Heroine with Intake Hairstyle
  • Exhibitionism
Rating 7.0925 Users
Kresnik ~Saiin ni Modaeru Kyuuketsuki Hunter~
Kresnik ~Saiin ni Modaeru Kyuuketsuki Hunter~
23%
Tags
  • Vampire Hunter Heroine
  • No "Keep Voice on Click" Option
  • Heroine with Shorts
  • Superpowers
  • Oneesan-type Heroine
Rating 6.8335 Users
Kinshin Souai ~Haha ni Koi Shita Boku~
Kinshin Souai ~Haha ni Koi Shita Boku~
23%
Tags
  • Haraguro Heroine
  • Only One Good Ending
  • Dildos
  • Villainous Heroine
  • Tribadism
Rating 6.6430 Users

Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~ has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
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Tags (35 total)

NameScoreImportanceWeight
Glasses Option3.002.487.44
Blood-related Brother/Sister Incest3.001.494.46
Buttjob1.502.874.31
Single Buttjob2.001.983.96
Modern Tsundere Heroine2.001.763.51
Exhibitionism2.001.653.31
Brocon Heroine2.001.613.22
Under the Same Roof2.501.273.18
High Sexual Content3.001.053.16
Heroine Having Sex with Others2.001.513.03
High School Student Protagonist2.501.203.01
Footjob1.501.892.84
Perverted Heroine2.001.412.82
Sex in Public Places2.501.092.72
Intercrural Sex2.001.352.69
Student Heroine2.501.002.49
Outdoor Sex2.501.002.49
Handjob1.501.512.27
Spoons1.501.492.23
Heroine with Glasses2.001.112.22
Incest1.002.122.12
Protagonist's Sister as a Heroine1.002.092.09
Multiple Endings3.000.672.00
Protagonist's Blood-related Sister as a Heroine1.001.951.95
Lactation During Sex1.501.271.91
Cowgirl2.000.841.68
Sixty-nine1.501.071.61
Sitting Sex1.501.061.59
Cunnilingus1.500.931.40
Nukige2.000.651.30
Doggy Style1.000.810.81
Male Protagonist2.500.300.75
ADV3.000.140.43
Blowjob0.331.120.37
2.000.000.00

Traits (63 total)

NameCharactersImportanceWeight
Traditional Bloomers Clothes13.072.13
Consensual Phone Sex Engages in (Sexual)13.032.10
Molesting Engages in12.711.88
School Athletic Club Member Role12.621.82
Split Personality Subject of12.551.77
Modern Tsundere Personality12.421.68
Exhibitionist Role12.411.67
No Panties Clothes12.411.67
Buttjob Engages in (Sexual)12.391.66
Incest Engages in (Sexual)21.471.61
Food Play Engages in (Sexual)12.231.55
Public Masturbation Engages in (Sexual)12.211.53
Footjob Subject of (Sexual)12.171.51
Third Person Personality12.111.47
Brother Complex Personality12.061.43
Sex in a Vehicle Engages in (Sexual)12.031.41
Voyeurism Subject of (Sexual)11.951.35
Mutual Masturbation Engages in (Sexual)11.941.34
Discreet Sex Engages in (Sexual)11.851.29
Intercrural Sex Engages in (Sexual)11.841.28
Planning Engages in11.831.27
Strict Personality11.831.27
Bob Cut Hair11.821.26
Hidden Eyes11.801.25
Older Brother Role11.731.20
Footjob Engages in (Sexual)11.721.19
Stubborn Personality11.681.16
Spoons Subject of (Sexual)11.671.16
Crop Top Clothes11.661.15
Pervert Personality11.631.13
Full Sister Role11.561.08
Sex in Water Engages in (Sexual)11.561.08
Sex in Front of an Audience Engages in (Sexual)11.501.04
Smart Personality11.461.01
Younger Sister Role11.451.00
Cooking Engages in11.420.98
Bathroom Sex Engages in (Sexual)11.390.96
Nipple Sucking Subject of (Sexual)11.380.96
Female Ejaculation Engages in (Sexual)11.360.95
T-shirt Clothes11.310.91
Black Hair20.810.89
Sex in Public Places Engages in (Sexual)11.260.87
Sixty-nine Engages in (Sexual)11.260.87
Watashi Personality11.250.87
Standing Sex Subject of (Sexual)11.180.81
Cunnilingus Subject of (Sexual)11.160.81
Outdoor Sex Engages in (Sexual)11.160.80
Handjob Engages in (Sexual)11.160.80
Missionary Subject of (Sexual)11.120.77
Glasses Clothes11.080.75
Quickie Fix Subject of (Sexual)11.080.75
Boobjob Engages in (Sexual)11.070.74
Miniskirt Clothes11.060.74
Sitting Sex Subject of (Sexual)11.060.74
Violet Eyes11.050.73
Cowgirl Subject of (Sexual)10.950.66
Virgin Sex Engages in (Sexual)10.850.59
Blowjob Engages in (Sexual)10.760.53
School Uniform Clothes10.760.52
Teen Body10.620.43
Short Hair10.610.42
Slim Body10.580.40
Pale Body10.370.25