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Summary

Seiya and Yukine finally start to go out after being friends since childhood. While they were shy about it first and had their doubts, their relationship quickly turned into a passionate one and led them explore their sexuality to the fullest... Which even included Amane, older sister of Yukine later on... Custom Sister ~Orechin no Iinari~ allows you to customize Yukine's appearance before you start the game.

Natsu no Osananajimi to, Fuyu no Kanojo
Natsu no Osananajimi to, Fuyu no Kanojo
NAN%
Tags
  • Student-Teacher Romance
  • Siscon Protagonist
  • Cousin Incest
  • Half-Japanese Heroine
  • Foreigner Heroine
Rating 7.0028 Users
Iegami Nyoubou ~Nanashi Nekomata wa KamiTuber~
Iegami Nyoubou ~Nanashi Nekomata wa KamiTuber~
NAN%
Tags
  • Lazy Heroine
  • Catgirl Heroine
  • Tailjob
  • Armpit Sex
  • Heroine with Kimono
Rating 6.8825 Users
Aka-chan Hoshii na ~Kyou kara Hajimaru Love Love Ecchi~
Aka-chan Hoshii na ~Kyou kara Hajimaru Love Love Ecchi~
NAN%
Tags
  • Heroine with Baby Complex
  • Pure Love Story
  • Cousin Incest
  • Only Protagonist's Relatives as Heroine(s)
  • Protagonist's Wife as a Heroine
Rating 6.8221 Users
Oshiete Sensei Otoko no Ko Gakuen ~Icha Love! Otoko no Ko Triangle~
Oshiete Sensei Otoko no Ko Gakuen ~Icha Love! Otoko no Ko Triangle~
NAN%
Tags
  • Only Uke Heroes
  • Only Trap Heroines
  • Trap Heroine
  • Male on Trap
  • Seme Protagonist
Rating 6.7232 Users
Josou Shite Ojou-sama Gakkou ni Sennyuu Shiyou to Shitara, Machigaete Tonari no Teihen Danshikou ni Haitteshimatta Boku
Josou Shite Ojou-sama Gakkou ni Sennyuu Shiyou to Shitara, Machigaete Tonari no Teihen Danshikou ni Haitteshimatta Boku
NAN%
Tags
  • Male on Trap
  • Uke Protagonist
  • White Haired Protagonist
  • Trap Protagonist
  • Group Sex of Several Males
Rating 5.8325 Users
Femboy Bangers - Pub & Grill
Femboy Bangers - Pub & Grill
NAN%
Tags
  • Waiter Hero
  • Bar
  • Ponytail Hero
  • Only Trap Heroines
  • Male on Trap
Rating 4.9323 Users
Ore no Imouto wa Seijun Bitch ~Oya ni wa Himitsu no Hamehame Seikatsu~
Ore no Imouto wa Seijun Bitch ~Oya ni wa Himitsu no Hamehame Seikatsu~
NAN%
Tags
  • Only Younger Heroines
  • Only Blood-related Heroines
  • Discreet Phone Sex
  • Only Protagonist's Sisters as Heroine(s)
  • Single Buttjob
Rating 6.6835 Users
Otoko no Ko Datte Dekiru mon! ~Wonderful Haramase Life~
Otoko no Ko Datte Dekiru mon! ~Wonderful Haramase Life~
NAN%
Tags
  • Shotacon Protagonist
  • Gay Shotacon
  • Seme Protagonist
  • Only Shota Heroes
  • Only Trap Heroines
Rating 6.3726 Users
Tonari no Seki no Gyaru Bitch ~Boku wa Kanojo no Sexfriend!?~
Tonari no Seki no Gyaru Bitch ~Boku wa Kanojo no Sexfriend!?~
NAN%
Tags
  • Skin Color Selection
  • Otaku Protagonist
  • Customization
  • Gyaru Heroine
  • Long Sexual Scenes
Rating 6.4527 Users
Miai Kekkon Shita Osanazuma ga Otoko no Ko Datta Ken
Miai Kekkon Shita Osanazuma ga Otoko no Ko Datta Ken
NAN%
Tags
  • Only Trap Heroines
  • Male Pregnancy
  • Hero with Beauty Mark
  • Arranged Marriage
  • Protagonist's Wife as a Heroine
Rating 5.8823 Users
Puru Moe Angel Idol Aiko
Puru Moe Angel Idol Aiko
NAN%
Tags
  • Only Uke Heroes
  • Shotacon Protagonist
  • Male on Trap
  • Seme Protagonist
  • Only Trap Heroines
Rating 6.8735 Users
Josou Shite Onnayu ni Sennyuu Shiyou to Shitara, Machigaete Haitta Otokoyu ga Hattenba Datta Ken
Josou Shite Onnayu ni Sennyuu Shiyou to Shitara, Machigaete Haitta Otokoyu ga Hattenba Datta Ken
NAN%
Tags
  • Group Sex of Several Males
  • Trap Protagonist
  • Male on Male Sex
  • Male on Male Sex Only
  • Nukige
Rating 5.2915 Users
Oreimo Plus
Oreimo Plus
NAN%
Tags
  • Protagonist's Younger Sister as a Heroine
  • Protagonist's Full Sister as a Heroine
  • Imouto-type Heroine
  • Heroine with Flat Chest (Non-Loli)
  • Blood-related Brother/Sister Incest
Rating 6.1295 Users
Aerial Life
Aerial Life
NAN%
Tags
  • Gaming
  • Confinement in a Simulated Reality
  • Virtual Reality
  • Gamer Heroine
  • Protagonist's Kouhai as a Heroine
Rating 6.3023 Users
Chupi Chupi Otoko no Ko ~Katei Kyoushi to Futago no Himitsu no Jugyou~
Chupi Chupi Otoko no Ko ~Katei Kyoushi to Futago no Himitsu no Jugyou~
NAN%
Tags
  • Only Uke Heroes
  • Only Trap Heroines
  • Seme Protagonist
  • Twincest
  • Tutor Protagonist
Rating 6.7641 Users
Yan Moe Futago Shimai ~Yande Harande Ai Sarete...~
Yan Moe Futago Shimai ~Yande Harande Ai Sarete...~
NAN%
Tags
  • Heroine with Baby Complex
  • Shimaidon with Twins Ending
  • Shimaidon Ending
  • Twin Sisters as Heroines
  • Yandere Heroine
Rating 6.4640 Users
Nise Bitch ~Riajuu Butte mo Pure de Ichizu na Osananajimi ni H na Kozukuri Lesson~
Nise Bitch ~Riajuu Butte mo Pure de Ichizu na Osananajimi ni H na Kozukuri Lesson~
NAN%
Tags
  • Cosplay
  • Footjob
  • Nympho Heroine
  • Spoons
  • Impregnation
Rating 6.3330 Users
Natsuiro Sagittarius Gaiden Ayato-kyun no Otoko no Ko Nikki
Natsuiro Sagittarius Gaiden Ayato-kyun no Otoko no Ko Nikki
NAN%
Tags
  • Seme Protagonist
  • Only Trap Heroines
  • Trap Support Character
  • Trap Heroine
  • Archery Club
Rating 6.8733 Users
Ane wa Kanojo de Senzoku Maid
Ane wa Kanojo de Senzoku Maid
NAN%
Tags
  • Homemaker Protagonist
  • Stockings
  • Wedding
  • Condoms
  • Oneesan-type Heroine
Rating 6.3839 Users
Ane☆Hara-mix 2
Ane☆Hara-mix 2
NAN%
Tags
  • Shinigami Heroine
  • Succubus Heroine
  • Inbreeding
  • Non-blood-related Brother/Sister Incest
  • Impregnation
Rating 6.7424 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!?
NAN%
Tags
  • Reverse Netorare
  • Protagonist's Sister as a Heroine
  • Brother/Sister Incest
  • Only Protagonist's Sisters as Heroine(s)
  • Protagonist's Blood-related Sister as a Heroine
Rating 6.9035 Users
WAS ~Lepidoptera no Sunadokei~
WAS ~Lepidoptera no Sunadokei~
NAN%
Tags
  • Personal Armed Combat
  • Church
  • Protagonist with Partial Voice Acting
  • Dystopia
  • Fighting Heroine
Rating 6.3555 Users
One Last Chance
One Last Chance
NAN%
Tags
  • Heroine with a Sundress
  • Modern Day United States of America
  • No Skip Read Text Option
  • No Quick Save/Load
  • Slice of Life Drama
Rating 4.9725 Users
Enjobu ~J* Bitch no Nikuana wa Ore Sen
Enjobu ~J* Bitch no Nikuana wa Ore Sen'you no Atsuatsu Onahole~
NAN%
Tags
  • Teacher Protagonist
  • Delinquent Heroine
  • Gyaru Heroine
  • Promiscuous Heroine
  • Heroine with Small Breasts (Non-Loli)
Rating 6.0314 Users
Boku Kano 3 ~ Otoko no Ko o Suki ni Naru Jun
Boku Kano 3 ~ Otoko no Ko o Suki ni Naru Jun'ai Triangle + 1
37%
Tags
  • Shotacon Protagonist
  • Brother/Brother Incest
  • Male on Male Sex Only
  • Trap Heroine
  • Male on Trap
Rating 6.3124 Users
Yankatsu! ~Yandere Futago to Hone no Zui made Icharabu Seikatsu Suru Hibi~
Yankatsu! ~Yandere Futago to Hone no Zui made Icharabu Seikatsu Suru Hibi~
32%
Tags
  • Shimaidon with Twins Ending
  • Shimaidon Ending
  • Balls Sucking
  • Yandere Heroine
  • Tribadism on Penis
Rating 5.8423 Users
Aerial Life
Aerial Life
31%
Tags
  • Gaming
  • Confinement in a Simulated Reality
  • Virtual Reality
  • Gamer Heroine
  • Protagonist's Kouhai as a Heroine
Rating 6.3023 Users
Oreimo Plus
Oreimo Plus
31%
Tags
  • Protagonist's Younger Sister as a Heroine
  • Protagonist's Full Sister as a Heroine
  • Imouto-type Heroine
  • Heroine with Flat Chest (Non-Loli)
  • Blood-related Brother/Sister Incest
Rating 6.1295 Users
Josou Shite Onnayu ni Sennyuu Shiyou to Shitara, Machigaete Haitta Otokoyu ga Hattenba Datta Ken
Josou Shite Onnayu ni Sennyuu Shiyou to Shitara, Machigaete Haitta Otokoyu ga Hattenba Datta Ken
30%
Tags
  • Group Sex of Several Males
  • Trap Protagonist
  • Male on Male Sex
  • Male on Male Sex Only
  • Nukige
Rating 5.2915 Users
Miai Kekkon Shita Osanazuma ga Otoko no Ko Datta Ken
Miai Kekkon Shita Osanazuma ga Otoko no Ko Datta Ken
27%
Tags
  • Only Trap Heroines
  • Male Pregnancy
  • Hero with Beauty Mark
  • Arranged Marriage
  • Protagonist's Wife as a Heroine
Rating 5.8823 Users
Puru Moe Angel Idol Aiko
Puru Moe Angel Idol Aiko
26%
Tags
  • Only Uke Heroes
  • Shotacon Protagonist
  • Male on Trap
  • Seme Protagonist
  • Only Trap Heroines
Rating 6.8735 Users
Otoko no Ko Datte Dekiru mon! ~Wonderful Haramase Life~
Otoko no Ko Datte Dekiru mon! ~Wonderful Haramase Life~
25%
Tags
  • Shotacon Protagonist
  • Gay Shotacon
  • Seme Protagonist
  • Only Shota Heroes
  • Only Trap Heroines
Rating 6.3726 Users
Tonari no Seki no Gyaru Bitch ~Boku wa Kanojo no Sexfriend!?~
Tonari no Seki no Gyaru Bitch ~Boku wa Kanojo no Sexfriend!?~
25%
Tags
  • Skin Color Selection
  • Otaku Protagonist
  • Customization
  • Gyaru Heroine
  • Long Sexual Scenes
Rating 6.4527 Users
Yan Moe Futago Shimai ~Yande Harande Ai Sarete...~
Yan Moe Futago Shimai ~Yande Harande Ai Sarete...~
25%
Tags
  • Heroine with Baby Complex
  • Shimaidon with Twins Ending
  • Shimaidon Ending
  • Twin Sisters as Heroines
  • Yandere Heroine
Rating 6.4640 Users
Natsuiro Sagittarius Gaiden Ayato-kyun no Otoko no Ko Nikki
Natsuiro Sagittarius Gaiden Ayato-kyun no Otoko no Ko Nikki
24%
Tags
  • Seme Protagonist
  • Only Trap Heroines
  • Trap Support Character
  • Trap Heroine
  • Archery Club
Rating 6.8733 Users
Ane☆Hara-mix 2
Ane☆Hara-mix 2
23%
Tags
  • Shinigami Heroine
  • Succubus Heroine
  • Inbreeding
  • Non-blood-related Brother/Sister Incest
  • Impregnation
Rating 6.7424 Users
WAS ~Lepidoptera no Sunadokei~
WAS ~Lepidoptera no Sunadokei~
22%
Tags
  • Personal Armed Combat
  • Church
  • Protagonist with Partial Voice Acting
  • Dystopia
  • Fighting Heroine
Rating 6.3555 Users
Enjobu ~J* Bitch no Nikuana wa Ore Sen
Enjobu ~J* Bitch no Nikuana wa Ore Sen'you no Atsuatsu Onahole~
22%
Tags
  • Teacher Protagonist
  • Delinquent Heroine
  • Gyaru Heroine
  • Promiscuous Heroine
  • Heroine with Small Breasts (Non-Loli)
Rating 6.0314 Users
Tenmon Dokei no Aria
Tenmon Dokei no Aria
22%
Tags
  • Ghost Heroine
  • Non-human Heroine
  • White Haired Heroine
  • Drama
  • Single Ending
Rating 6.9022 Users
Harem Mate
Harem Mate
21%
Tags
  • Realtime 3D
  • Free Camera
  • Manager Protagonist
  • Anime-looking 3D
  • Idol Heroine
Rating 5.9527 Users
Otoko no Ko Gakuen! ~3nin no Otoko no Ko-tachi to no Unmei no Deai, Soshite Boku-tachi wa Koi ni Ochiru!~
Otoko no Ko Gakuen! ~3nin no Otoko no Ko-tachi to no Unmei no Deai, Soshite Boku-tachi wa Koi ni Ochiru!~
21%
Tags
  • Only Trap Heroines
  • Trap on Male
  • Trap Heroine
  • Student Hero
  • Male on Male Sex
Rating 6.2621 Users
Ookami Shoujo to Issho Christmas Special Edition
Ookami Shoujo to Issho Christmas Special Edition
21%
Tags
  • Anime-looking 3D
  • Werewolf Heroine
  • Sexual Cosplay
  • Doggirl Heroine
  • Realtime 3D
Rating 6.9279 Users
Oni Chichi After ~Nure Suke Airi to Amayadori Hen~
Oni Chichi After ~Nure Suke Airi to Amayadori Hen~
20%
Tags
  • Non-blood-related Father/Daughter Incest
  • Only Protagonist's Relatives as Heroine(s)
  • Rain
  • Only Younger Heroines
  • Half-Japanese Heroine
Rating 6.0422 Users
Shindan no Kekka, Sore wa Koi no Yamai Desu
Shindan no Kekka, Sore wa Koi no Yamai Desu
20%
Tags
  • Medical Doctor Heroine
  • Genre Savvy Protagonist
  • Protagonist's Non-blood-related Sister as a Heroine
  • Nurse Heroine
  • Spring
Rating 6.6922 Users
Lovecha ~Tsumasakidachi de, Hitomi o Tojite~
Lovecha ~Tsumasakidachi de, Hitomi o Tojite~
20%
Tags
  • Elementary School
  • Elementary School Student Heroine
  • Only Loli Heroines
  • Student-Teacher Romance
  • Armpit Licking
Rating 6.2225 Users
Love Love Otoko no Ko Ryou ~Boku o Ubaiau Otouto to Net Idol
Love Love Otoko no Ko Ryou ~Boku o Ubaiau Otouto to Net Idol
20%
Tags
  • Group Sex of Several Males
  • Only Trap Heroines
  • Blood-related Brother/Brother Incest
  • Reversible Yaoi Pairing
  • Half-Japanese Hero
Rating 5.9426 Users
Love Majo!
Love Majo!
19%
Tags
  • Central Heroine
  • Defloration During Common Route
  • Gauge Display
  • Panchira
  • Twin Handjob
Rating 6.6321 Users

Custom☆Sister ~Ore Chin no Iinari~ 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 (20 total)

NameScoreImportanceWeight
Customization2.832.176.13
Modern Tsundere Heroine2.801.764.94
Fictional Modern Day Japanese Town2.251.964.40
Heroine with Zettai Ryouiki3.001.404.19
Single Ending3.001.384.14
Protagonist's Childhood Friend as a Heroine3.001.143.43
Protagonist in Relationship2.001.452.89
High Sexual Content2.671.052.80
Few Choices2.001.342.67
Student Protagonist2.001.262.51
Romance2.670.902.39
Student Heroine2.000.991.98
Nukige3.000.651.95
Missionary Position2.000.941.88
Doggy Style2.000.801.61
Infidelity1.001.511.51
Group Sex of One Male and Several Females1.500.921.37
Defloration1.000.760.76
Male Protagonist2.500.300.76
ADV2.600.150.38

Traits (12 total)

NameCharactersImportanceWeight
Customizable Appearance Role12.751.91
Childhood Friend Role21.261.38
Older Sister Role11.561.08
Younger Sister Role11.441.00
Parted in Middle Hair11.250.87
Red Eyes11.200.83
Blue Hair11.190.83
Teen Body20.620.68
Slim Body20.580.63
Waist Length+ Hair10.810.56
School Uniform Clothes10.750.52
Pale Body20.370.41