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Summary

"I want to rape my younger sister" Older brother Tomoyuki and younger sister Rinne are ordinary siblings. They live like normal, get along and fight like normal. But she has become the object of his desire and each night he sneaks into her room. Again and again he masturbates to her sleeping form as she lies there defenseless. This summer they're forced to spend more time together. She's grown more delicate, her arms are softer, her hair is growing longer. His sister, like a sweet flower that's begun to open up and bloom, is becoming a young woman. The summer sun shines brilliantly now and sweat trickles down her neck from the heat. When he closes his eyes he sees her smile up at him. He cannot suppress his lust any longer. <Translated from the official site>

Shoujo to Sekai to Okashi no Ken ~Route of Ayano~
Shoujo to Sekai to Okashi no Ken ~Route of Ayano~
NAN%
Tags
  • Middle School
  • Occult Club
  • Middle School Student Heroine
  • Bokukko Heroine
  • Delusion
Rating 7.3027 Users
Daisuki na Sensei ni H na Onedari Shichau Omase na Boku no / Watashi no Puni Puni
Daisuki na Sensei ni H na Onedari Shichau Omase na Boku no / Watashi no Puni Puni
NAN%
Tags
  • Pedophile Protagonist
  • Trap Heroine
  • Domicile
  • Quiz Game
  • Sickly Heroine
Rating 6.2222 Users
Chocolate Princess! ~Ingoku no!? Homestay~
Chocolate Princess! ~Ingoku no!? Homestay~
NAN%
Tags
  • Huge Insertion
  • Mermaid Heroine
  • Gaping
  • Inflation
  • Heroine with Visible Panties
Rating 6.9427 Users
Oshioki Sweetie ~Koi Suru Onee-san wa Urahara Desu~
Oshioki Sweetie ~Koi Suru Onee-san wa Urahara Desu~
NAN%
Tags
  • Sexual Cosplay
  • Straight Shotacon
  • Early Branching Plot
  • Western-style Manor
  • Heroine with Chinese Dress
Rating 6.9341 Users
Ryoubo -Maternity Insult-
Ryoubo -Maternity Insult-
NAN%
Tags
  • Protagonist's Blood-related Mother as a Heroine
  • Blood-related Mother/Son Incest
  • Body Piercing
  • Heroine With Kansai Accent
  • Pregnancy
Rating 6.8036 Users
Bakunyuu Hoken Onna Kyoushi
Bakunyuu Hoken Onna Kyoushi
NAN%
Tags
  • Sex in a School Infirmary
  • School Nurse Heroine
  • Clothed Male Naked Female
  • Bisexual Heroine
  • Teacher Heroine
Rating 6.5933 Users
Ai Shimai ~Futari no Kajitsu~
Ai Shimai ~Futari no Kajitsu~
NAN%
Tags
  • Blood-related Sister/Sister Incest
  • Non-twin Heroine Sisters
  • Rape with Blackmail
  • Rapist Protagonist
  • Sexual Slavery
Rating 6.4522 Users
Soul Foundation+
Soul Foundation+
NAN%
Tags
  • Gundam
  • Flat Tints Only
  • Blowjob Duck Face
  • Heroine with Huge Breasts
  • Fan-fiction
Rating 6.8121 Users
Taiyou no Promia Flowering Days
Taiyou no Promia Flowering Days
NAN%
Tags
  • Beach
  • Resort
  • Protagonist's Girlfriend as a Heroine
  • Librarian Heroine
  • Leader Heroine
Rating 7.0821 Users
Jukubo Gui ~Moto Guradoru no Okaa-san~
Jukubo Gui ~Moto Guradoru no Okaa-san~
NAN%
Tags
  • Blackmail
  • Sexual Devices
  • Threesome Ending
  • Naked Heroine with Apron
  • Netori
Rating 7.3225 Users
Love Fetish ~Ashi Fetish Ashikoki Hen~
Love Fetish ~Ashi Fetish Ashikoki Hen~
NAN%
Tags
  • Feet Licking
  • Flat Tints Only
  • Footjob
  • Legwear Footjob
  • Modern Day
Rating 7.1224 Users
In
In'yoku Celeb Tsuma 2 ~Chijoku Seisai~
NAN%
Tags
  • Sexual Slavery
  • Netori
  • Body Piercing
  • Married Heroine
  • Modern Day Japan
Rating 6.8521 Users
Love Fetish ~Tekoki Hen~
Love Fetish ~Tekoki Hen~
NAN%
Tags
  • Flat Tints Only
  • High Sexual Content
  • Modern Day
  • Tsundere Heroine
  • Heroine with Zettai Ryouiki
Rating 6.7722 Users
Demiparadoxia ∞ Hookerstic - Hokujou Hen
Demiparadoxia ∞ Hookerstic - Hokujou Hen
NAN%
Tags
  • Prostitute Heroine
  • Heroine with Anal Hair
  • Heroine with Armpit Hair
  • Pubic Hair Option
  • Hotel
Rating 6.4723 Users
Yarasete! Teacher Sotsugyou
Yarasete! Teacher Sotsugyou
NAN%
Tags
  • Only Older Heroines
  • Heroine with Glasses
  • Single Ending
  • Teacher Heroine
  • Student Protagonist
Rating 5.9925 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
Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~
Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~
NAN%
Tags
  • Glasses Option
  • Blood-related Brother/Sister Incest
  • Buttjob
  • Single Buttjob
  • Modern Tsundere Heroine
Rating 5.9320 Users
Momojiri Taiiku Onna Kyoushi
Momojiri Taiiku Onna Kyoushi
NAN%
Tags
  • Heroine with Tights
  • P.E. Teacher Heroine
  • Braless Heroine
  • Unavoidable Heroine Rape by the Protagonist
  • Lots of Event CGs
Rating 6.2020 Users
Shoujo to Sekai to Okashi no Ken ~Route of Nana~
Shoujo to Sekai to Okashi no Ken ~Route of Nana~
NAN%
Tags
  • Middle School
  • Middle School Student Heroine
  • Brief Branches Only
  • Student Club Member Heroine
  • Bokukko Heroine
Rating 7.6120 Users
Sweets!! -Oshioki Sweetie Fandisc-
Sweets!! -Oshioki Sweetie Fandisc-
NAN%
Tags
  • Protagonist with Voice Acting
  • Big Breast Sizes Heroine
  • Excessive Semen
  • Legwear Footjob
  • Maid Heroine
Rating 6.9224 Users
Houkago ☆ Eroge Bu! ~Eroge Seisaku no Tame Onna no Ko to Ecchi Shimakuri na Mainichi~
Houkago ☆ Eroge Bu! ~Eroge Seisaku no Tame Onna no Ko to Ecchi Shimakuri na Mainichi~
NAN%
Tags
  • Student Club President Protagonist
  • Production of Pornography (Drawn)
  • Student Club Member Heroine
  • Censored Text
  • Design Story
Rating 7.2858 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
Shin Yakin Byoutou
Shin Yakin Byoutou
NAN%
Tags
  • Medical Doctor Protagonist
  • Nurse Support Character
  • Body Smell Fetish
  • Close-up CGs
  • Villainous Protagonist
Rating 6.9821 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 6.3220 Users
Demiparadoxia ∞ Hookerstic - Nanka Hen
Demiparadoxia ∞ Hookerstic - Nanka Hen
46%
Tags
  • Prostitute Heroine
  • Pubic Hair Option
  • Hotel
  • Customization
  • Sex Involving Prostitution
Rating 6.2928 Users
Love Fetish ~Paizuri Hen~
Love Fetish ~Paizuri Hen~
44%
Tags
  • Flat Tints Only
  • Reverse Trap Heroine
  • Naizuri
  • Small Breast Sizes Heroine (Non-Loli)
  • Bokukko Heroine
Rating 6.8020 Users
Demiparadoxia ∞ Hookerstic - Hokujou Hen
Demiparadoxia ∞ Hookerstic - Hokujou Hen
40%
Tags
  • Prostitute Heroine
  • Heroine with Anal Hair
  • Heroine with Armpit Hair
  • Pubic Hair Option
  • Hotel
Rating 6.4723 Users
Love Fetish ~Tekoki Hen~
Love Fetish ~Tekoki Hen~
40%
Tags
  • Flat Tints Only
  • High Sexual Content
  • Modern Day
  • Tsundere Heroine
  • Heroine with Zettai Ryouiki
Rating 6.7722 Users
In
In'yoku Celeb Tsuma 2 ~Chijoku Seisai~
40%
Tags
  • Sexual Slavery
  • Netori
  • Body Piercing
  • Married Heroine
  • Modern Day Japan
Rating 6.8521 Users
Jukubo Gui ~Moto Guradoru no Okaa-san~
Jukubo Gui ~Moto Guradoru no Okaa-san~
39%
Tags
  • Blackmail
  • Sexual Devices
  • Threesome Ending
  • Naked Heroine with Apron
  • Netori
Rating 7.3225 Users
Love Fetish ~Ashi Fetish Ashikoki Hen~
Love Fetish ~Ashi Fetish Ashikoki Hen~
38%
Tags
  • Feet Licking
  • Flat Tints Only
  • Footjob
  • Legwear Footjob
  • Modern Day
Rating 7.1224 Users
Soul Foundation+
Soul Foundation+
36%
Tags
  • Gundam
  • Flat Tints Only
  • Blowjob Duck Face
  • Heroine with Huge Breasts
  • Fan-fiction
Rating 6.8121 Users
Taiyou no Promia Flowering Days
Taiyou no Promia Flowering Days
36%
Tags
  • Beach
  • Resort
  • Protagonist's Girlfriend as a Heroine
  • Librarian Heroine
  • Leader Heroine
Rating 7.0821 Users
Ookami Shoujo Reona -Yasei Houkai Hakuchi Kyouiku-
Ookami Shoujo Reona -Yasei Houkai Hakuchi Kyouiku-
35%
Tags
  • Rapist Protagonist
  • Internal Exhibition of Sex
  • Central Heroine
  • Sexual Devices
  • Object Insertion
Rating 6.6620 Users
Momojiri Taiiku Onna Kyoushi
Momojiri Taiiku Onna Kyoushi
35%
Tags
  • Heroine with Tights
  • P.E. Teacher Heroine
  • Braless Heroine
  • Unavoidable Heroine Rape by the Protagonist
  • Lots of Event CGs
Rating 6.2020 Users
Sweets!! -Oshioki Sweetie Fandisc-
Sweets!! -Oshioki Sweetie Fandisc-
35%
Tags
  • Protagonist with Voice Acting
  • Big Breast Sizes Heroine
  • Excessive Semen
  • Legwear Footjob
  • Maid Heroine
Rating 6.9224 Users
Lilith-Izm05 ~Tairyou Shasei Hen~
Lilith-Izm05 ~Tairyou Shasei Hen~
34%
Tags
  • P.E. Teacher Heroine
  • Anthology
  • Half-Japanese Heroine
  • Unavoidable Rape
  • Mindbreak
Rating 6.2825 Users
Kodomo no Himitsu
Kodomo no Himitsu
34%
Tags
  • Elementary School
  • Elementary School Student Heroine
  • Student-Teacher Romance
  • Sex Involving Children
  • Shota Support Character
Rating 6.3220 Users
Douryou no Oku-san ~Netori Tsuma, Netorare Tsuma~
Douryou no Oku-san ~Netori Tsuma, Netorare Tsuma~
33%
Tags
  • Netori
  • Clothed Male Naked Female
  • Wake-up Sex
  • Love Hotel
  • Sex in a Vehicle
Rating 7.0626 Users
Lilith-Izm07 ~Ore no Pet Hen~
Lilith-Izm07 ~Ore no Pet Hen~
32%
Tags
  • Yuki-onna Heroine
  • All the Way Through
  • BDSM
  • Anthology
  • Mahou Shoujo Heroine
Rating 6.3324 Users
Hatsujou Exorcist! ~Harau to Hatsujou Suru Ojou-sama ni Tsukaetemasu.~
Hatsujou Exorcist! ~Harau to Hatsujou Suru Ojou-sama ni Tsukaetemasu.~
32%
Tags
  • Yuki-onna Heroine
  • Butler Protagonist
  • Dragon Heroine
  • Exorcism
  • Sex Under the Necessity
Rating 6.6432 Users
D-EVE in you
D-EVE in you
31%
Tags
  • Japanese Idols
  • Idol Heroine
  • Singer Heroine
  • Heroine with Intake Hairstyle
  • Exhibitionism
Rating 7.0925 Users
Lilith-Izm08 ~Nobushito Black Izm~
Lilith-Izm08 ~Nobushito Black Izm~
31%
Tags
  • Unavoidable Heroine Rape
  • Kunoichi Heroine
  • Hetare Protagonist
  • Heroine with Tattoo
  • Small Breast Sizes Heroine (Non-Loli)
Rating 6.9636 Users
Rin x Sen ~Hakudaku Onna Kyoushi to Yaroudomo~
Rin x Sen ~Hakudaku Onna Kyoushi to Yaroudomo~
30%
Tags
  • Clothed Male Naked Female
  • All-boys School
  • Yakuza
  • High Amounts of Rape
  • Teacher Heroine
Rating 7.4629 Users
Chikan Ou ~In
Chikan Ou ~In'yoku no Kaihousha~
30%
Tags
  • Chikan Protagonist
  • Chikan
  • Glory Hole Sex
  • Molestation on Public Transport
  • Discreet Sex
Rating 6.0021 Users
Nantai Prima Onna Kyoushi
Nantai Prima Onna Kyoushi
30%
Tags
  • Bisexual Heroine
  • Autocunnilingus
  • Big Breast Sizes Heroine
  • Sexual Devices
  • Sex in a Classroom
Rating 6.5922 Users
GREATER HEAL
GREATER HEAL
29%
Tags
  • Gyaru Heroine
  • Skin Color Selection
  • Flat Tints Only
  • Hotel
  • Twin Handjob
Rating 6.3723 Users
Nozoki Seikatsu ~Bijin Oyako no Ana to Ana!~
Nozoki Seikatsu ~Bijin Oyako no Ana to Ana!~
29%
Tags
  • American Heroine
  • Voyeurism
  • Blood-related Aunt/Nephew Incest
  • Fictional Modern Day Japanese Countryside
  • Protagonist's Aunt as a Heroine
Rating 5.8421 Users

Imouto Ninshin 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 (35 total)

NameScoreImportanceWeight
Inbreeding2.751.985.45
Only Blood-related Heroines2.002.094.17
Only Protagonist's Sisters as Heroine(s)2.001.993.98
Only Younger Heroines2.001.943.88
Impregnation2.751.373.78
Brother/Sister Incest1.802.053.68
Only Loli Heroines2.001.783.55
Reverse Missionary2.001.683.36
No Character Sprites2.001.633.26
Only a Single Heroine2.671.022.71
Anal Penetration2.001.322.64
Gaping1.002.432.43
Lolicon1.291.732.24
Only Virgin Heroines2.001.082.16
Sitting Sex2.001.052.11
Pregnant Sex1.671.181.96
Heroine with a Braid1.001.961.96
Nukige3.000.651.95
Sex with Sleepers1.001.901.90
Loli Heroine1.601.191.90
Wake-up Sex1.001.811.81
Vibrators1.501.151.73
Defloration2.000.761.52
Masturbation1.001.491.49
Sex in Water1.001.411.41
Multiple Penetration1.001.281.28
Bathroom Sex1.001.191.19
Blowjob1.001.121.12
Quickie Fix Position1.001.111.11
Cowgirl1.000.840.84
Male Protagonist2.750.300.83
Sexual Content1.000.630.63
Rapist Protagonist0.331.750.58
ADV2.000.140.29
0.330.000.00

Traits (62 total)

NameCharactersImportanceWeight
Tickle Torture Engages in (Sexual)13.952.74
Inbreeding Engages in (Sexual)22.202.42
Tickle Torture Subject of (Sexual)13.242.25
Vaginal Multiple Objects Insertion Subject of (Sexual)12.831.96
Furisode Clothes12.771.92
Sleep Sex Engages in (Sexual)12.761.92
Sleep Sex Subject of (Sexual)12.491.73
Armpit Sex Engages in (Sexual)12.481.72
Wake-up Sex Subject of (Sexual)12.481.72
Bestiality Engages in (Sexual)12.461.70
Incest Engages in (Sexual)21.471.61
Rope Bondage Harness Clothes12.291.59
Vaginal + Anal Object Insertion Subject of (Sexual)12.251.56
Bathroom Sex Engages in (Sexual)21.391.52
Tiny Braid Hair12.071.44
Ankle Socks Clothes12.011.39
Vibrator Subject of (Sexual)11.981.37
Full Brother Role11.951.35
Vaginal Gaping Engages in (Sexual)11.951.35
Quickie Fix Engages in (Sexual)11.881.30
Sexual Blindfold Subject of (Sexual)11.851.29
Intercrural Sex Engages in (Sexual)11.841.28
Handjob Engages in (Sexual)21.161.27
Hidden Eyes11.801.25
Anal Sex Engages in (Sexual)11.761.22
Pajamas Clothes11.751.21
Missionary Engages in (Sexual)11.741.21
Reverse Missionary Subject of (Sexual)11.741.20
Cowgirl Engages in (Sexual)11.711.19
Group Sex of One Female and Several Males Engages in (Sexual)11.701.18
Rope Bondage Subject of (Sexual)11.671.16
Garnet Eyes11.661.15
Small Breasts Body11.661.15
Double Penetration (Group Sex) Subject of (Sexual)11.651.14
Mini-dress Clothes11.631.13
Bondage Sex Subject of (Sexual)11.581.09
Sex in Water Engages in (Sexual)11.561.08
Blowjob Subject of (Sexual)11.521.05
Pissing Engages in (Sexual)11.471.02
Kid Body11.370.95
Bukkake Subject of (Sexual)11.350.93
Pubic Hair Hair11.340.93
Ribbon Hair Tie Clothes11.190.83
Anal Sex Subject of (Sexual)11.190.82
Standing Sex Subject of (Sexual)11.180.81
Butterfly Subject of (Sexual)11.170.81
Cunnilingus Subject of (Sexual)11.160.81
Outdoor Sex Engages in (Sexual)11.160.80
Quickie Fix Subject of (Sexual)11.080.75
Vaginal Fingering Subject of (Sexual)11.080.75
Sitting Sex Subject of (Sexual)11.060.74
Spiky Bangs Hair11.000.69
Cowgirl Subject of (Sexual)10.950.66
Straight Hair10.940.65
Doggy Style Subject of (Sexual)10.920.64
Shoulder-length Hair10.920.64
Black Hair10.800.56
Blowjob Engages in (Sexual)10.760.53
Brown Hair10.680.47
Short Hair10.610.42
Slim Body10.580.40
Pale Body10.370.26