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Summary

Shinichi visits his grandparents on the countryside. There he meets a sickly ojousama, Asami, and got reacquainted with a girl he doesn't recall so well, Mari. What he thought to be a calm romantic summer vacation turns out to be a shameful erotic mishap when a mischievous girl pulled a prank on him. He's tricked to eat a mushroom that causes him to have erection round the clock. Shinichi the erection prince, as townsfolk calls him, swore vengeance. But first of all, he has to calm his penis down.

Hitozuma Swimming Club
Hitozuma Swimming Club
NAN%
Tags
  • Co-worker Heroine
  • Kneepit Sex
  • Part-time Job
  • Non-blood-related Mother/Son Incest
  • Heroine with Swimsuits
Rating 7.2669 Users
Oharai Onee-san! ~Otouto o Yuuwaku Shinasai~
Oharai Onee-san! ~Otouto o Yuuwaku Shinasai~
NAN%
Tags
  • Occult Club
  • Spontaneous Power-ups
  • Homosexual Support Character
  • Blood-related Brother/Sister Incest
  • Heroine with Wings
Rating 6.5120 Users
Shin Onna Kyoushi Yuuwaku Shinro Shidoushitsu
Shin Onna Kyoushi Yuuwaku Shinro Shidoushitsu
NAN%
Tags
  • Protagonist with Health Issues
  • School Nurse Support Character
  • School Nurse Heroine
  • Heroine with Sport Bloomers
  • Remote-controlled Vibrator
Rating 6.7027 Users
Shukubo no Uzuki 2 ~Ureta Hitozuma kara Tadayou "Onna" no Iroka~
Shukubo no Uzuki 2 ~Ureta Hitozuma kara Tadayou "Onna" no Iroka~
NAN%
Tags
  • Principal Heroine
  • Sex Involving Menstruation
  • Single Hole Double Penetration (obsolete)
  • Timid Heroine
  • Only Non-Virgin Heroines
Rating 7.3251 Users
Aimai Ren
Aimai Ren'ai
NAN%
Tags
  • Non-twin Heroine Sisters
  • Twin Buttjob
  • Mentor Support Character
  • Orphan Heroine
  • Okama Support Character
Rating 6.8054 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
Aneboku ~Onee-chan wa Bijin 3 Shimai~
Aneboku ~Onee-chan wa Bijin 3 Shimai~
NAN%
Tags
  • Brother/Sister Romance
  • Protagonist with Phimosis
  • Romancing a Family
  • Protagonist's Non-blood-related Sister as a Heroine
  • Single Hole Multiple Objects Insertion (obsolete)
Rating 7.1623 Users
Maid in Witch Life! -Yakata de Hajimaru H na Miryou Seikatsu-
Maid in Witch Life! -Yakata de Hajimaru H na Miryou Seikatsu-
NAN%
Tags
  • Witch Heroine
  • Chuunibyou Heroine
  • Voice Saving
  • Maid Heroine
  • Heroine with Garter Belt
Rating 7.2636 Users
Najimi no Oba-chan ~Batsuichi Jukujo to Inran Miboujin~
Najimi no Oba-chan ~Batsuichi Jukujo to Inran Miboujin~
NAN%
Tags
  • Widow Heroine
  • Heroine with Armpit Hair
  • Heroine with Kimono
  • Dildos
  • Rope Bondage
Rating 6.8822 Users
Sex Teacher Tsuyoshi ~Junjou Otome ga Nurashichau Himitsu no Seikan Jugyou~
Sex Teacher Tsuyoshi ~Junjou Otome ga Nurashichau Himitsu no Seikan Jugyou~
NAN%
Tags
  • School Sports Club Member Heroine
  • Erotic Massage
  • Principal Heroine
  • All-girls School
  • Protagonist with Sexual Experience
Rating 7.1666 Users
Onii-chan!! Shasei no Kanri wa Imouto ni Makasete!!
Onii-chan!! Shasei no Kanri wa Imouto ni Makasete!!
NAN%
Tags
  • Full Chastity Belt
  • Quadruple+ Blowjob
  • Clothed Female Naked Male
  • Protagonist's Sister as a Heroine
  • Cosplay
Rating 6.9630 Users
Hani Tsuma Hs ~After Wedding~
Hani Tsuma Hs ~After Wedding~
NAN%
Tags
  • Deredere Heroine
  • Cousin Romance
  • Student-Teacher Romance
  • Class President Heroine
  • Impregnation
Rating 7.6134 Users
Himegoto Union Motto H!
Himegoto Union Motto H!
NAN%
Tags
  • Reverse Trap Heroine
  • Shimaidon
  • Linear Plot
  • Twin Handjob
  • Soapy Massage
Rating 7.3321 Users
Yuganda Ren
Yuganda Ren'ai Moyou
NAN%
Tags
  • Facesitting
  • Threesome
  • Heroine with Crotchless Clothing
  • Double Penetration (Group Sex)
  • Heroine with Tights
Rating 7.4936 Users
Ayame no Machi to Ohime-sama
Ayame no Machi to Ohime-sama
NAN%
Tags
  • Homecoming
  • Fictional Modern Day Japanese Town
  • Otaku Heroine
  • Enforced Playing Order
  • Ojousama Heroine
Rating 6.4038 Users
Juku Volley ~Shigoki Shigokareru Ureta Hitozuma-tachi~
Juku Volley ~Shigoki Shigokareru Ureta Hitozuma-tachi~
NAN%
Tags
  • Volleyball Club
  • Sports
  • Triple Boobjob
  • Fictional Modern Day Japanese Countryside
  • Heroine with Beauty Mark
Rating 7.1938 Users
Ane Yome Concerto
Ane Yome Concerto
NAN%
Tags
  • Ear-Cleaning
  • Glasses Option
  • Ejaculation Forewarner
  • Mirror Sex
  • Protagonist's Wife as a Heroine
Rating 7.5153 Users
Chu Shite Agechau ~Oshikake Onee-san no Seikou Chiryou~
Chu Shite Agechau ~Oshikake Onee-san no Seikou Chiryou~
NAN%
Tags
  • Illness
  • Medical Doctor Heroine
  • Triple Blowjob
  • Group Sex of Several Females
  • Footjob
Rating 6.9639 Users
Harame ~Seishi o Hoshigaru Midara na Oshiego~
Harame ~Seishi o Hoshigaru Midara na Oshiego~
NAN%
Tags
  • Nude Filter
  • Fictional Modern Day Japanese Countryside
  • Pregnancy Good Ending
  • Countryside
  • Kneepit Sex
Rating 6.6544 Users
Yuuwaku Onna Kyoushi ~Ureta Mitsu no Aji~
Yuuwaku Onna Kyoushi ~Ureta Mitsu no Aji~
NAN%
Tags
  • Only Older Heroines
  • Heroine with Children
  • Student-Teacher Romance
  • Obacon
  • School Nurse Heroine
Rating 6.7620 Users
Papa Doki! ~Papa ga Daisuki Dakedo, Kazoku Dakara Mondai Nai yo ne!~
Papa Doki! ~Papa ga Daisuki Dakedo, Kazoku Dakara Mondai Nai yo ne!~
NAN%
Tags
  • Rejuvenation
  • Fathercon Heroine
  • Protagonist's Blood-related Daughter as a Heroine
  • Homemaker Protagonist
  • Blood-related Father/Daughter Incest
Rating 7.0196 Users
Hara Katsu! 3 ~Kozukuri Business Haigyou no Kiki!?~
Hara Katsu! 3 ~Kozukuri Business Haigyou no Kiki!?~
NAN%
Tags
  • Group (4+) Boobjob
  • Divorcee Heroine
  • Actress Heroine
  • Onahole
  • Only Adult Heroines
Rating 6.9333 Users
Cosplay Ecchi ~Layer Kana no Yuuutsu~
Cosplay Ecchi ~Layer Kana no Yuuutsu~
NAN%
Tags
  • Strong Female Protagonist
  • Protagonist with Big Breasts
  • Heroine with Leotard
  • Vaginal + Anal Object Insertion
  • Masturbation with Object
Rating 6.7226 Users
Milk Junkie 2
Milk Junkie 2
NAN%
Tags
  • Shimaidon Ending
  • Blood-related Sister/Sister Incest
  • Big Breast Sizes Heroine
  • Soapy Massage
  • Changeable Font
Rating 7.5924 Users
Oshirikko Venus 2
Oshirikko Venus 2
39%
Tags
  • Non-penetrative Sex
  • Big Ass Heroine
  • Perverted Protagonist
  • Twin Footjob
  • Sex on a Roof
Rating 7.2533 Users
Natsu Doki! Harem ~Shinsekitaku de no Nayameru Juken Benkyou~
Natsu Doki! Harem ~Shinsekitaku de no Nayameru Juken Benkyou~
37%
Tags
  • Cousin Incest
  • Sister/Sister Incest
  • Aunt/Nephew Incest
  • Blood-related Sister/Sister Incest
  • Protagonist's Cousin as a Heroine
Rating 7.1243 Users
Yuganda Ren
Yuganda Ren'ai Moyou
36%
Tags
  • Facesitting
  • Threesome
  • Heroine with Crotchless Clothing
  • Double Penetration (Group Sex)
  • Heroine with Tights
Rating 7.4936 Users
Himegoto Union Motto H!
Himegoto Union Motto H!
36%
Tags
  • Reverse Trap Heroine
  • Shimaidon
  • Linear Plot
  • Twin Handjob
  • Soapy Massage
Rating 7.3321 Users
Hani Tsuma Hs ~After Wedding~
Hani Tsuma Hs ~After Wedding~
34%
Tags
  • Deredere Heroine
  • Cousin Romance
  • Student-Teacher Romance
  • Class President Heroine
  • Impregnation
Rating 7.6134 Users
Sex Teacher Tsuyoshi ~Junjou Otome ga Nurashichau Himitsu no Seikan Jugyou~
Sex Teacher Tsuyoshi ~Junjou Otome ga Nurashichau Himitsu no Seikan Jugyou~
33%
Tags
  • School Sports Club Member Heroine
  • Erotic Massage
  • Principal Heroine
  • All-girls School
  • Protagonist with Sexual Experience
Rating 7.1666 Users
Onii-chan!! Shasei no Kanri wa Imouto ni Makasete!!
Onii-chan!! Shasei no Kanri wa Imouto ni Makasete!!
32%
Tags
  • Full Chastity Belt
  • Quadruple+ Blowjob
  • Clothed Female Naked Male
  • Protagonist's Sister as a Heroine
  • Cosplay
Rating 6.9630 Users
Maid in Witch Life! -Yakata de Hajimaru H na Miryou Seikatsu-
Maid in Witch Life! -Yakata de Hajimaru H na Miryou Seikatsu-
32%
Tags
  • Witch Heroine
  • Chuunibyou Heroine
  • Voice Saving
  • Maid Heroine
  • Heroine with Garter Belt
Rating 7.2636 Users
Najimi no Oba-chan ~Batsuichi Jukujo to Inran Miboujin~
Najimi no Oba-chan ~Batsuichi Jukujo to Inran Miboujin~
31%
Tags
  • Widow Heroine
  • Heroine with Armpit Hair
  • Heroine with Kimono
  • Dildos
  • Rope Bondage
Rating 6.8822 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
  • Heroine with Beauty Mark
Rating 7.1938 Users
Chu Shite Agechau ~Oshikake Onee-san no Seikou Chiryou~
Chu Shite Agechau ~Oshikake Onee-san no Seikou Chiryou~
31%
Tags
  • Illness
  • Medical Doctor Heroine
  • Triple Blowjob
  • Group Sex of Several Females
  • Footjob
Rating 6.9639 Users
Yuuwaku Onna Kyoushi ~Ureta Mitsu no Aji~
Yuuwaku Onna Kyoushi ~Ureta Mitsu no Aji~
31%
Tags
  • Only Older Heroines
  • Heroine with Children
  • Student-Teacher Romance
  • Obacon
  • School Nurse Heroine
Rating 6.7620 Users
Hara Katsu! 3 ~Kozukuri Business Haigyou no Kiki!?~
Hara Katsu! 3 ~Kozukuri Business Haigyou no Kiki!?~
31%
Tags
  • Group (4+) Boobjob
  • Divorcee Heroine
  • Actress Heroine
  • Onahole
  • Only Adult Heroines
Rating 6.9333 Users
Milk Junkie 2
Milk Junkie 2
30%
Tags
  • Shimaidon Ending
  • Blood-related Sister/Sister Incest
  • Big Breast Sizes Heroine
  • Soapy Massage
  • Changeable Font
Rating 7.5924 Users
Kinshin Souai ~Haha ni Koi Shita Boku~
Kinshin Souai ~Haha ni Koi Shita Boku~
30%
Tags
  • Haraguro Heroine
  • Only One Good Ending
  • Dildos
  • Villainous Heroine
  • Tribadism
Rating 6.6430 Users
Ane ga Boku no Seieki Tsuki Pantsu o Haku Wake
Ane ga Boku no Seieki Tsuki Pantsu o Haku Wake
30%
Tags
  • Only Protagonist's Sisters as Heroine(s)
  • Clumsy Heroine
  • Perverted Protagonist
  • Cosplay
  • Siscon Protagonist
Rating 6.6722 Users
Toraba!
Toraba!
30%
Tags
  • Romancing a Family
  • Swimming Club
  • Class President Heroine
  • Foolish Friend
  • Oyakodon Ending
Rating 6.8824 Users
Ore ga Kousoku! Nakadashi Igai wa Kousoku Ihan!!! ~Joshikousei Zen
Ore ga Kousoku! Nakadashi Igai wa Kousoku Ihan!!! ~Joshikousei Zen'in Nakadashi Kanzen Seiatsu Keikaku~
29%
Tags
  • Internet
  • Casting Couch
  • Delinquent Heroine
  • More Than Seven Heroines
  • Student Council Member Heroine
Rating 7.3558 Users
Classmate no Okaa-san -Immoral Teacher-
Classmate no Okaa-san -Immoral Teacher-
29%
Tags
  • Masturbation with Object
  • Widow Heroine
  • Sexual Fantasizing
  • Heroine with Tights
  • Naked Heroine with Apron
Rating 6.8223 Users
Nozoki Seikatsu ~Bijin Oyako no Ana to Ana!~
Nozoki Seikatsu ~Bijin Oyako no Ana to Ana!~
29%
Tags
  • Voyeurism
  • Blood-related Aunt/Nephew Incest
  • Fictional Modern Day Japanese Countryside
  • Protagonist's Aunt as a Heroine
  • Masturbation with Object
Rating 5.8421 Users
Lucky Sukebe na Ore no Nichijou ~Bijin na Hahaoya to Miboujin ga Doukyo Shite Ore ni Sematte Kuru Ken~
Lucky Sukebe na Ore no Nichijou ~Bijin na Hahaoya to Miboujin ga Doukyo Shite Ore ni Sematte Kuru Ken~
29%
Tags
  • Protagonist's Blood-related Mother as a Heroine
  • Blood-related Mother/Son Incest
  • Widow Heroine
  • BDSM
  • Only Adult Heroines
Rating 6.6340 Users
Aneimo Neo ~Second Sisters~
Aneimo Neo ~Second Sisters~
29%
Tags
  • Protagonist's Aunt as a Heroine
  • Non-blood-related Mother/Son Incest
  • Protagonist's Non-blood-related Mother as a Heroine
  • Romancing a Family
  • Oneesan-type Heroine
Rating 7.1137 Users
Breed! Breed-Island.
Breed! Breed-Island.
29%
Tags
  • Childishly Violent Heroine
  • Island
  • Oneesan-type Heroine
  • Heroine with Bodystocking
  • Shimaidon with Twins Ending
Rating 6.6723 Users
Pafu Pafu Sentou Monogatari! ~Machi no Ofuroya-san, Hanjou no Hiketsu wa H na Massage~
Pafu Pafu Sentou Monogatari! ~Machi no Ofuroya-san, Hanjou no Hiketsu wa H na Massage~
29%
Tags
  • Defloration During Common Route
  • Prostitution
  • Romancing a Family
  • Oyakodon Ending
  • Single Buttjob
Rating 6.4627 Users

Natsu Doki! has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
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Tags (49 total)

NameScoreImportanceWeight
Heroine with a Sundress3.002.838.50
Sunflowers2.002.835.65
Nude Filter2.002.575.14
Maid Support Character2.002.214.42
Defloration During Common Route2.002.194.38
Sickly Heroine2.002.174.33
Childhood Promise2.002.134.26
Non-human Heroine2.002.074.14
Countryside2.002.054.10
Female Protagonist for a Short Time2.002.034.06
Sex Under the Necessity2.001.983.96
Read Text Marking2.001.843.67
Short Sexual Scenes2.001.833.65
Reverse Missionary2.001.683.37
Summer2.001.673.33
French Kiss2.001.663.32
Discreet Sex2.001.603.21
Threesome2.001.603.19
Sex at School2.001.603.19
Piledriver2.001.593.18
Sex in Front of an Audience2.001.472.94
Ojousama Heroine2.001.452.89
Kissing Scene2.001.442.88
Long Sexual Scenes1.501.892.84
Intercrural Sex2.001.352.69
Twin Blowjob2.001.292.57
Female Ejaculation2.001.272.55
Student Protagonist2.001.262.53
Side Portraits2.001.162.31
Quickie Fix Position2.001.122.23
Only Virgin Heroines2.001.082.17
Sixty-nine2.001.072.15
Standing Sex2.001.062.11
Sitting Sex2.001.062.11
Student Heroine2.001.002.00
Outdoor Sex2.001.001.99
Missionary Position2.000.941.88
Cunnilingus2.000.931.86
Unavoidable Heroine Rape1.001.841.84
Group Sex of One Male and Several Females2.000.921.83
Heroine with Big Breasts2.000.841.67
Doggy Style2.000.811.61
Defloration2.000.761.52
Multiple Endings2.000.671.34
Nukige2.000.651.30
Sexual Content2.000.631.26
Bondage1.001.111.11
Male Protagonist2.000.300.60
ADV2.000.140.29

Traits (68 total)

NameCharactersImportanceWeight
Sun Hat Clothes12.711.88
New Type School Swimsuit Clothes12.531.75
Big Breast Sizes Body21.561.71
Shop Clerk Role12.421.68
Weakness Subject of12.391.66
Twin Blowjob Engages in (Sexual)21.451.59
Blowjob Duck Face Engages in (Sexual)12.241.55
Cowgirl Subject of (Sexual)40.951.54
Claret Hair12.161.50
Tominagi Subject of (Sexual)21.361.49
Sundress Clothes12.141.49
Virgin Sex Engages in (Sexual)40.851.37
Anal Sex Subject of (Sexual)21.191.31
Timid Personality11.861.29
Butterfly Subject of (Sexual)21.171.29
Group Sex of One Male and Several Females Engages in (Sexual)21.171.29
Yukata Clothes11.851.28
Doggy Style Subject of (Sexual)30.921.28
Maid Role11.841.27
Outdoor Sex Engages in (Sexual)21.161.27
Handjob Engages in (Sexual)21.161.27
String Ribbon Tie Clothes11.821.26
Hair Ribbon Clothes11.801.25
Big Breasts Body21.131.24
Missionary Subject of (Sexual)21.121.23
Hair Flower Clothes11.771.23
Blowjob Engages in (Sexual)40.761.22
Reverse Missionary Subject of (Sexual)11.741.20
Quickie Fix Subject of (Sexual)21.081.19
Naive Personality11.691.17
Shorts Clothes11.681.16
Rope Bondage Subject of (Sexual)11.671.16
Spoons Subject of (Sexual)11.671.16
Wealthy Role11.661.15
Kind Personality21.031.13
Maid's Headdress Clothes11.631.13
Bondage Sex Subject of (Sexual)11.581.10
Sex at School Engages in (Sexual)11.551.07
Maid's Dress Clothes11.511.05
Sailor School Uniform Clothes11.471.02
Bikini Clothes11.461.01
Pantyhose Clothes11.430.99
Hairpin Clothes11.400.97
Masturbation Engages in (Sexual)11.400.97
Grey Hair11.380.96
Nipple Sucking Subject of (Sexual)11.380.96
Wavy Hair11.360.94
Waist Length+ Hair20.810.89
Sixty-nine Engages in (Sexual)11.260.87
Friendly Personality11.220.84
Standing Sex Subject of (Sexual)11.180.81
Twin Tails Hair11.130.78
Ponytail Hair11.100.76
Vaginal Fingering Subject of (Sexual)11.080.75
Miniskirt Clothes11.060.74
Violet Eyes11.050.73
Amber Eyes11.030.72
Green Eyes11.020.71
Teen Body20.620.68
Straight Hair10.940.65
Shoulder-length Hair10.920.64
Slim Body20.580.63
Blond Hair10.890.62
Black Hair10.810.56
Blue Eyes10.800.56
School Uniform Clothes10.760.52
Long Hair10.750.52
Pale Body20.370.40