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Summary

Reiichi lives a peaceful life with Uko, his childhood friend, and Koinu, his younger sister. But one day, a mysterious girl, August, suddenly appears in front of him and says, "You, my Cthulhu!" His life completely changes... Reiichi knows that he is actually her Cthulhu and gets involved in an epic battle... [From ErogeShop]

Inunaki
Inunaki
NAN%
Tags
  • Yamato Nadeshiko Heroine
  • Widow Heroine
  • Enforced Playing Order
  • Twincest
  • Ojousama Heroine
Rating 6.7031 Users
BALDR SKY Core Defender
BALDR SKY Core Defender
NAN%
Tags
  • Mecha Pilot Protagonist
  • Mecha Combat
  • Mecha
  • Spontaneous Sex Scenes
  • Genius Heroine
Rating 6.2446 Users
Dear My Friend
Dear My Friend
NAN%
Tags
  • Modifications
  • Priestess Heroine
  • Smoker Protagonist
  • Winter
  • Clumsy Heroine
Rating 6.8121 Users
Chrono Belt ~Ayakashibito & Bullet Butlers Crossover Disc~
Chrono Belt ~Ayakashibito & Bullet Butlers Crossover Disc~
NAN%
Tags
  • Mentor Support Character
  • Duel
  • Dual Wielding Pistols
  • Sentient Weapon Heroine
  • Combat with Automatic Firearms
Rating 7.5847 Users
Yuugeki Keikan Patvessel ~Kochira Shutoken Joukuu Aozorasho~
Yuugeki Keikan Patvessel ~Kochira Shutoken Joukuu Aozorasho~
NAN%
Tags
  • Police Officer Protagonist
  • Police Officer Heroine
  • Mecha Combat
  • Fictional Futuristic Japanese Town
  • Spaceship
Rating 7.0841 Users
SEVEN-BRIDGE
SEVEN-BRIDGE
NAN%
Tags
  • Mute Heroine
  • Journey
  • Trains
  • Past
  • Drama
Rating 7.0629 Users
Mahou no Shugo Hime Artemina
Mahou no Shugo Hime Artemina
NAN%
Tags
  • Mahou Shoujo Protagonist
  • Loli Protagonist
  • High Amounts of Rape
  • Ponytail Protagonist
  • Insemination by Non-Humanoids
Rating 6.2824 Users
AGEHA ~EXTRAVAGANZA~
AGEHA ~EXTRAVAGANZA~
NAN%
Tags
  • Prison
  • Unavoidable Protagonist Rape
  • Sex with Insects
  • Unavoidable Heroine Rape
  • Grotesque Body Modification
Rating 5.3934 Users
Extravaganza ~Mushi Mederu Shoujo~
Extravaganza ~Mushi Mederu Shoujo~
NAN%
Tags
  • Choosing Factions
  • Genetic Research
  • Guro
  • Built-in Flowchart
  • Sex with Insects
Rating 7.98117 Users
MinDeaD BlooD ~Mayu to Mana no Yuketsubako~
MinDeaD BlooD ~Mayu to Mana no Yuketsubako~
NAN%
Tags
  • Duel
  • Vampire
  • Side Character Rape by Others
  • Vampire Hunter Heroine
  • Battle of Wits
Rating 6.9958 Users
Mugen Kairou
Mugen Kairou
NAN%
Tags
  • Butler Protagonist
  • Master and Servant
  • Pegging
  • Trap Protagonist
  • Multiple Route Mystery
Rating 6.8174 Users
Mugen Kairou 2 ~Rasen~
Mugen Kairou 2 ~Rasen~
NAN%
Tags
  • Master and Servant
  • Time Loop
  • Multiple Route Mystery
  • Paraphilic Infantilism
  • Pragmatic Heroine
Rating 6.8640 Users
GUN-KATANA - Non-Human-Killer
GUN-KATANA - Non-Human-Killer
NAN%
Tags
  • Bounty Hunter Protagonist
  • Choosing Factions
  • Action Game
  • Dark Fantasy
  • Island
Rating 7.4766 Users
Maple Colors 2
Maple Colors 2
NAN%
Tags
  • Tactician Support Character
  • Rifle Combat
  • Tactician Heroine
  • Hotblooded Protagonist
  • Tournament
Rating 7.7932 Users
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
NAN%
Tags
  • Choosing Factions
  • Vampire Hunter Heroine
  • Undead
  • Unarmed Combat
  • Vampire
Rating 7.69139 Users
Zoku Satsuriku no Django -Jigoku no Shoukinkubi-
Zoku Satsuriku no Django -Jigoku no Shoukinkubi-
NAN%
Tags
  • Western
  • Rebellion
  • Combat with Firearms
  • Cowgirl Heroine
  • High Amount of Bad Endings
Rating 7.63141 Users
Mushitsukai
Mushitsukai
NAN%
Tags
  • Sex with Insects
  • Scat Filter
  • Combat with Exotic Weapons
  • Consensual Sex Involving Slime Monsters
  • Symbiote / Parasite
Rating 6.6128 Users
Gokuin no Sentou
Gokuin no Sentou
NAN%
Tags
  • Businesswoman Heroine
  • Fortune-teller Heroine
  • Completely Avoidable Heroine Rape
  • Confinement
  • Blood-related Incest
Rating 6.4748 Users
Yami no Koe Zero
Yami no Koe Zero
NAN%
Tags
  • Sexual Fantasizing
  • Dominatrix Heroine
  • Western-style Manor
  • Sexual Corruption
  • Group Sex of Several Females
Rating 6.8538 Users
Sayoko
Sayoko
NAN%
Tags
  • Rejuvenation
  • Futanari Protagonist
  • Long Sexual Scenes
  • Penis Growth
  • Breast Expansion
Rating 6.1244 Users
-atled-
-atled-
NAN%
Tags
  • Orphan Heroine
  • Male Protagonist for a Short Time
  • Musician Hero
  • Time Travel
  • Musical Themes
Rating 7.0738 Users
With Ribbon
With Ribbon
NAN%
Tags
  • Support Character with Multiple Personalities
  • Daughter Support Character
  • Homemaker Protagonist
  • Student Council Member Heroine
  • Perverted Friend
Rating 7.2257 Users
Chu x Chu! On The Move ~Kenran Jikuu no Festival~
Chu x Chu! On The Move ~Kenran Jikuu no Festival~
NAN%
Tags
  • Musical Environment
  • Vampire Heroine
  • Idol Heroine
  • Nude Filter
  • Japanese Idols
Rating 7.0823 Users
Cthulhu ~Great Hunting~
Cthulhu ~Great Hunting~
52%
Tags
  • Cthulhu Mythos
  • Heroine with Heterochromia
  • Symbiote / Parasite
  • Heroine with Jeans
  • Twin Sisters as Heroines
Rating 5.8520 Users
Before Dawn Daybreak ~Shin
Before Dawn Daybreak ~Shin'en no Utahime~
33%
Tags
  • Heroine with Flat Chest (Non-Loli)
  • Heroine with Chinese Dress
  • High Amounts of Rape
  • Guro
  • Hairjob
Rating 6.4424 Users
GUN-KATANA - Non-Human-Killer
GUN-KATANA - Non-Human-Killer
33%
Tags
  • Bounty Hunter Protagonist
  • Choosing Factions
  • Action Game
  • Dark Fantasy
  • Island
Rating 7.4766 Users
Mugen Kairou 2 ~Rasen~
Mugen Kairou 2 ~Rasen~
29%
Tags
  • Master and Servant
  • Time Loop
  • Multiple Route Mystery
  • Paraphilic Infantilism
  • Pragmatic Heroine
Rating 6.8640 Users
Mugen Kairou
Mugen Kairou
29%
Tags
  • Butler Protagonist
  • Master and Servant
  • Pegging
  • Trap Protagonist
  • Multiple Route Mystery
Rating 6.8174 Users
Extravaganza ~Mushi Mederu Shoujo~
Extravaganza ~Mushi Mederu Shoujo~
28%
Tags
  • Choosing Factions
  • Genetic Research
  • Guro
  • Built-in Flowchart
  • Sex with Insects
Rating 7.98117 Users
MinDeaD BlooD ~Mayu to Mana no Yuketsubako~
MinDeaD BlooD ~Mayu to Mana no Yuketsubako~
28%
Tags
  • Duel
  • Vampire
  • Side Character Rape by Others
  • Vampire Hunter Heroine
  • Battle of Wits
Rating 6.9958 Users
Mahou no Shugo Hime Artemina
Mahou no Shugo Hime Artemina
27%
Tags
  • Mahou Shoujo Protagonist
  • Loli Protagonist
  • High Amounts of Rape
  • Ponytail Protagonist
  • Insemination by Non-Humanoids
Rating 6.2824 Users
AGEHA ~EXTRAVAGANZA~
AGEHA ~EXTRAVAGANZA~
26%
Tags
  • Prison
  • Unavoidable Protagonist Rape
  • Sex with Insects
  • Unavoidable Heroine Rape
  • Grotesque Body Modification
Rating 5.3934 Users
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
25%
Tags
  • Choosing Factions
  • Vampire Hunter Heroine
  • Undead
  • Unarmed Combat
  • Vampire
Rating 7.69139 Users
Mushitsukai
Mushitsukai
25%
Tags
  • Sex with Insects
  • Scat Filter
  • Combat with Exotic Weapons
  • Consensual Sex Involving Slime Monsters
  • Symbiote / Parasite
Rating 6.6128 Users
Yami no Koe Zero
Yami no Koe Zero
24%
Tags
  • Sexual Fantasizing
  • Dominatrix Heroine
  • Western-style Manor
  • Sexual Corruption
  • Group Sex of Several Females
Rating 6.8538 Users
-atled-
-atled-
24%
Tags
  • Orphan Heroine
  • Male Protagonist for a Short Time
  • Musician Hero
  • Time Travel
  • Musical Themes
Rating 7.0738 Users
Chu x Chu! On The Move ~Kenran Jikuu no Festival~
Chu x Chu! On The Move ~Kenran Jikuu no Festival~
24%
Tags
  • Musical Environment
  • Vampire Heroine
  • Idol Heroine
  • Nude Filter
  • Japanese Idols
Rating 7.0823 Users
R.U.R.U.R ~Kono Ko no Tame ni, Semete Kirei na Hoshizora o~
R.U.R.U.R ~Kono Ko no Tame ni, Semete Kirei na Hoshizora o~
24%
Tags
  • Hard Science Fiction
  • Future Setting in a Fictional World
  • Artificial Intelligence
  • Nanomachines
  • Spaceship
Rating 7.3423 Users
Ore wa Shoujo Mangaka
Ore wa Shoujo Mangaka
23%
Tags
  • Comic Convention
  • Artist Protagonist
  • Tsukkomi Heroine
  • Mangaka Protagonist
  • Mangaka Heroine
Rating 7.1923 Users
Anonymous
Anonymous
22%
Tags
  • Psychological Horror
  • High Amount of Special Effects
  • Depression
  • Blackmail
  • Unavoidable Rape
Rating 6.9132 Users
Mugen Kairou 1.5 ~Rensa~
Mugen Kairou 1.5 ~Rensa~
21%
Tags
  • Butler Protagonist
  • Submissive Protagonist
  • Master and Servant
  • Female Domination
  • Trap Protagonist
Rating 5.6533 Users
Mugen no Sakura ~Hitsuya-hime Injoku Youshokutan~
Mugen no Sakura ~Hitsuya-hime Injoku Youshokutan~
21%
Tags
  • Class President Protagonist
  • Monster Birth
  • Penis Growth
  • Rape by Others
  • Huge Insertion
Rating 6.8024 Users
Ayakashi H
Ayakashi H
21%
Tags
  • Summoning
  • Dragon
  • Heroine with Chinese Dress
  • Fictional Beings
  • Clumsy Heroine
Rating 7.1521 Users
Atori no Sora to Shinchuu no Tsuki
Atori no Sora to Shinchuu no Tsuki
20%
Tags
  • Orphan Heroine
  • Slice of Life Drama
  • Traditionalist Family
  • Blind Heroine
  • Conspiracy
Rating 7.2520 Users
Chu x Chu Idol 2 -Melodies x Memories-
Chu x Chu Idol 2 -Melodies x Memories-
20%
Tags
  • Vampire Heroine
  • Idol Heroine
  • Musical Environment
  • Japanese Idols
  • Heroine with Heterochromia
Rating 7.3525 Users
Extravaganza ~Mushigurui Hen~
Extravaganza ~Mushigurui Hen~
20%
Tags
  • Insects
  • Hero with Children
  • Coprophagia
  • Madness
  • Completely Avoidable Heroine Rape
Rating 7.4332 Users
Sousei Kitan Aerial
Sousei Kitan Aerial
20%
Tags
  • Airplane Combat
  • Coming-of-Age Drama
  • Future Earth
  • Mecha Pilot Protagonist
  • Mecha
Rating 7.3472 Users

Cthulhu ~Otome no Fureru, Tenshi no Yubisaki~ 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 (61 total)

NameScoreImportanceWeight
Battle Royale3.002.597.77
Cthulhu Mythos2.602.707.03
Scat Filter2.003.356.70
Childhood Promise3.002.126.37
Extremely (un)Lucky Heroine2.003.126.25
Sex Involving Amputees2.002.935.87
Unbirth2.002.895.77
Heroine with Bodystocking2.002.685.36
Master and Servant2.332.285.31
Symbiote / Parasite2.002.635.25
Protagonist with Tentacles2.002.595.18
Heroine with Jeans2.002.585.17
Plant Sex2.002.575.15
Consensual Sex With Monsters2.002.474.95
Fighting Heroine3.001.624.85
Wet and Messy2.002.404.80
Sex with Insects2.002.384.75
Heroine with Eyepatch2.002.344.67
Single Hole Multiple Tentacle Penetration (obsolete)2.002.334.66
Imouto-type Heroine2.671.724.60
All the Way Through2.002.224.45
Guro2.002.224.43
Heroine with Heterochromia2.002.204.40
Erotic Electrostimulation2.002.194.38
Shapeshifting2.002.184.36
Futanari on Female2.002.104.19
Villainous Heroine2.002.074.15
Tentacle Rape3.001.344.03
Lesbian Rape2.002.014.02
Insemination by Non-Humanoids2.002.003.99
Monster Birth2.001.973.93
Breast Expansion2.001.963.92
Protagonist's Senpai as a Heroine2.331.673.89
Penis Growth2.001.943.88
Gore2.001.933.86
Consensual Sex Involving Tentacles2.001.913.83
Unlockable Routes2.501.483.70
Twin Sisters as Heroines2.001.813.62
Sexual Corruption2.001.793.58
Protagonist's Childhood Friend as a Heroine3.001.133.39
Scat2.001.683.36
Ojousama Heroine2.331.433.33
Excessive Semen2.001.643.27
High Sexual Content3.001.033.09
Dark Skinned Heroine2.001.502.99
Sex in Water2.001.402.79
Heroine with Zettai Ryouiki2.001.372.75
Parody1.501.802.71
Mystery2.001.302.61
Lactation During Sex2.001.252.49
Ahegao2.001.242.49
Bukkake2.001.192.38
Naked Sprites2.001.052.09
Protagonist with a Face3.000.661.97
Yandere Heroine1.001.881.88
Sexual Slavery1.001.611.61
Horror1.001.431.43
Lesbian Sex1.251.141.42
Male Protagonist2.250.300.67
Urination Fetish0.251.630.41
ADV2.670.140.39

Traits (150 total)

NameCharactersImportanceWeight
Non-human Role42.313.72
Tentacle Body32.613.62
Fur Trim Clothes22.472.71
Mini-dress Clothes41.632.62
Suspenders Clothes22.302.52
Heterochromia Eyes22.272.50
Gothic Clothes22.182.39
Himedere Personality13.442.38
Ankle Boots Clothes22.112.32
Flat Chest Body22.112.32
Hairpin Clothes41.392.24
Repeater Role13.222.23
Tsurime Eyes41.382.22
Miniskirt Clothes71.072.21
Straight Hair90.962.21
Thigh-high Stockings Clothes71.032.15
Multiple Eyes Eyes13.082.14
Timid Personality21.872.06
Sailor School Uniform Clothes31.482.05
Guide Role12.892.00
Ribbon Tie Clothes41.242.00
Beanie Clothes12.751.91
Foreign Exchange Student Role12.731.89
Kid Body31.361.88
Small Breasts Body21.711.88
Grumbler Personality12.681.86
Spiky Hair21.681.85
Loose Necktie Clothes12.661.84
Garnet Eyes21.651.81
Patterned Thigh-high Stockings Clothes12.611.81
Gloomy Personality12.601.80
Capri Pants Clothes12.601.80
Fighting Engages in31.291.79
Dog Role12.541.76
Childhood Friend Role31.251.73
Homeroom Teacher Role12.461.71
Classmate Role31.231.70
Trench Coat Clothes12.451.70
Ankle-Strap Shoes Clothes12.441.69
Vest Clothes21.531.68
Cigarette Items12.391.66
Big Breasts Body31.191.66
Smart Personality21.471.61
Eccentric Personality12.301.60
Shrug Clothes12.301.59
Foreigner Role12.271.58
Black Eyes21.431.57
Pantyhose Clothes21.421.56
Escape From Confinement Engages in12.251.56
V Bangs Hair21.421.56
Eyepatch Clothes12.241.55
Slim Body140.571.55
Trap Body12.221.54
School Uniform Clothes70.731.52
Tareme Eyes31.091.51
Knee-high Socks Clothes21.371.50
Pet Owner Role12.171.50
Bandages Clothes12.141.49
Mary Jane Clothes12.131.47
Sundress Clothes12.131.47
White Hair21.341.47
Insightful Personality12.121.47
Short Body12.081.44
Docile Personality12.061.43
Sly Personality12.061.43
Cross-dressing Engages in12.051.42
Amber Eyes31.021.42
Smoking Engages in12.051.42
Teen Body90.611.41
Furry Tail Body12.031.40
Neighbor Role11.991.38
Turtleneck Shirt Clothes11.991.38
Ring Clothes11.971.37
Scar Body11.971.36
Cold-hearted Personality11.961.36
Full Brother Role11.951.35
Curious Personality11.941.35
Taciturn Personality11.941.34
Old Body11.941.34
Atashi Personality11.911.32
Younger Brother Role11.901.32
Villain Role11.891.31
Jealous Personality11.891.31
Rude Personality11.891.31
Violet Hair21.191.30
Ribbon Hair Tie Clothes21.181.30
Tsundere Personality11.871.30
Blue Eyes40.801.29
Waist Length+ Hair40.801.29
Twin Sister Role11.851.28
Blunt Personality11.851.28
Maid Role11.851.28
Antagonist Role11.831.27
Shoulder-length Hair30.911.26
Younger Appearance Body11.821.26
Based on a Real Person Role11.821.26
Brown Eyes30.901.25
Cheerful Personality11.781.24
Braid Hair11.781.23
Outgoing Personality11.761.22
Long Hair40.751.21
Mischievous Personality11.741.21
Sports Shoes Clothes11.731.20
Older Brother Role11.721.20
Hoodie Clothes11.721.19
Coat Clothes11.701.18
Arrogant Personality11.701.18
Mysterious Personality11.701.18
Crop Top Clothes11.691.17
Cyan Eyes11.671.16
Olive Body11.661.15
Drinking Engages in11.641.14
Collar Clothes11.641.14
Popular Role11.641.13
Maid's Headdress Clothes11.621.12
Senpai Role11.601.11
Jeans Clothes11.581.10
Full Sister Role11.571.09
Medium Breasts Body11.561.08
Older Sister Role11.551.08
Sidehair Hair20.971.07
Choker Clothes11.521.05
Orange Hair11.511.04
Maid's Dress Clothes11.511.04
Green Hair11.471.02
Younger Sister Role11.441.00
Headband Clothes11.430.99
Tank Top Clothes11.430.99
Pale Body130.370.98
Grey Hair11.390.96
Wavy Hair11.360.94
Pink Hair11.320.92
Red Hair11.320.92
Ahoge Hair11.310.91
Curtained Hair11.300.90
Black Hair20.810.89
Dress Clothes11.240.86
Young-adult Body20.770.85
Trousers Clothes11.210.84
Short Hair30.610.84
Red Eyes11.190.83
Shirt Clothes11.150.80
Ponytail Hair11.100.76
Glasses Clothes11.080.75
Brown Hair20.680.75
Parted to Side Hair11.070.74
Kind Personality11.040.72
Spiky Bangs Hair11.010.70
Green Eyes11.010.70
Blond Hair10.880.61