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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]

VenusBlood Savior
VenusBlood Savior
NAN%
Tags
  • Petrification
  • Navel Penetration
  • Sacred Treasure
  • Living Clothes Sex
  • Consensual Sex Involving Slime Monsters
Rating 7.7036 Users
Ryoujoku Gakuenchou / Dorei Club ~Dokushin Choukyouroku~
Ryoujoku Gakuenchou / Dorei Club ~Dokushin Choukyouroku~
NAN%
Tags
  • Human Cattle
  • Sexual Slavery
  • Heroine with Armpit Hair
  • Heroine with Latex
  • Mouth Gag
Rating 7.0536 Users
Ayakashi H
Ayakashi H
NAN%
Tags
  • Summoning
  • Dragon
  • Heroine with Chinese Dress
  • Fictional Beings
  • Clumsy Heroine
Rating 7.1322 Users
Gokuin no Sentou
Gokuin no Sentou
NAN%
Tags
  • Businesswoman Heroine
  • Fortune-teller Heroine
  • Completely Avoidable Heroine Rape
  • Confinement
  • Blood-related Incest
Rating 6.4550 Users
Alter Ego
Alter Ego
NAN%
Tags
  • Simulation Game
  • SRPG
  • Oneesan-type Heroine
  • Protagonist's Senpai as a Heroine
  • Protagonist's Kouhai as a Heroine
Rating 6.7220 Users
Mugen no Sakura ~Hitsuya-hime Injoku Youshokutan~
Mugen no Sakura ~Hitsuya-hime Injoku Youshokutan~
NAN%
Tags
  • Class President Protagonist
  • Monster Birth
  • Penis Growth
  • Rape by Others
  • Huge Insertion
Rating 6.5730 Users
Nekonade Distortion Exodus
Nekonade Distortion Exodus
NAN%
Tags
  • Single Character Multiple Defloration
  • Philosophy
  • Blood-related Incest
  • Scenario Selection
  • Pragmatic Heroine
Rating 6.9523 Users
-atled-
-atled-
NAN%
Tags
  • Orphan Heroine
  • Male Protagonist for a Short Time
  • Musician Hero
  • Time Travel
  • Musical Themes
Rating 7.0440 Users
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
NAN%
Tags
  • Choosing Factions
  • Vampire Hunter Heroine
  • Undead
  • Vampire Protagonist
  • Unarmed Combat
Rating 7.66151 Users
Mugen Kairou
Mugen Kairou
NAN%
Tags
  • Butler Protagonist
  • Master and Servant
  • Pegging
  • Trap Protagonist
  • Multiple Route Mystery
Rating 6.7083 Users
Touka Gettan
Touka Gettan
NAN%
Tags
  • Simulation Game
  • Mystery
  • Fantasy
  • Fictional World
  • Brocon Heroine
Rating 7.5322 Users
Extravaganza ~Mushi Mederu Shoujo~
Extravaganza ~Mushi Mederu Shoujo~
NAN%
Tags
  • Choosing Factions
  • Genetic Research
  • Coming-of-Age Drama
  • Completion Status Indicator
  • Built-in Flowchart
Rating 8.08138 Users
Mugen Kairou 2 ~Rasen~
Mugen Kairou 2 ~Rasen~
NAN%
Tags
  • Master and Servant
  • Time Loop
  • Multiple Route Mystery
  • Paraphilic Infantilism
  • Pragmatic Heroine
Rating 6.6744 Users
Before Dawn Daybreak ~Shin
Before Dawn Daybreak ~Shin'en no Utahime~
NAN%
Tags
  • Corporations
  • Rebellion
  • Red-light District
  • Fighting Protagonist
  • Heroine with Chinese Dress
Rating 6.5128 Users
Mugen Kairou 1.5 ~Rensa~
Mugen Kairou 1.5 ~Rensa~
NAN%
Tags
  • Butler Protagonist
  • Submissive Protagonist
  • Master and Servant
  • Female Domination
  • Trap Protagonist
Rating 5.5234 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 6.2925 Users
Natsu no Kotou no Yami no Koe
Natsu no Kotou no Yami no Koe
NAN%
Tags
  • Crossover
  • Lesbian Sex Only
  • Villainous Heroine
  • Lesbian Domination
  • Western-style Manor
Rating 5.9226 Users
AGEHA ~EXTRAVAGANZA~
AGEHA ~EXTRAVAGANZA~
NAN%
Tags
  • Prison
  • Unavoidable Protagonist Rape
  • Sex with Insects
  • Unavoidable Heroine Rape
  • Heroine with Small Breasts (Non-Loli)
Rating 5.4738 Users
BALDR SKY Core Defender
BALDR SKY Core Defender
NAN%
Tags
  • Mecha Pilot Protagonist
  • Mecha Combat
  • Mecha
  • Spontaneous Sex Scenes
  • Genius Heroine
Rating 6.2548 Users
White Clarity
White Clarity
NAN%
Tags
  • Past
  • Albino Heroine
  • Unlockable Routes
  • Western-style Manor
  • Orphan Protagonist
Rating 7.2620 Users
Shitai o Arau
Shitai o Arau
NAN%
Tags
  • Rounin Protagonist
  • Hint Corner
  • Hospital
  • Nurse Heroine
  • Madness
Rating 7.3145 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 6.9861 Users
Inunaki
Inunaki
NAN%
Tags
  • Countryside
  • Twincest
  • Brother/Sister Romance
  • Protagonist's Twin as a Heroine
  • Yamato Nadeshiko Heroine
Rating 6.6038 Users
Mushitsukai
Mushitsukai
NAN%
Tags
  • Sex with Insects
  • Scat Filter
  • Combat with Exotic Weapons
  • Consensual Sex Involving Slime Monsters
  • Symbiote / Parasite
Rating 6.6935 Users
Cthulhu ~Great Hunting~
Cthulhu ~Great Hunting~
53%
Tags
  • Cthulhu Mythos
  • Heroine with Heterochromia
  • Symbiote / Parasite
  • Heroine with Jeans
  • Twin Sisters as Heroines
Rating 5.8420 Users
GUN-KATANA - Non-Human-Killer
GUN-KATANA - Non-Human-Killer
34%
Tags
  • Bounty Hunter Protagonist
  • Choosing Factions
  • Shooter Game
  • Action Game
  • Dark Fantasy
Rating 7.6071 Users
Before Dawn Daybreak ~Shin
Before Dawn Daybreak ~Shin'en no Utahime~
34%
Tags
  • Corporations
  • Rebellion
  • Red-light District
  • Fighting Protagonist
  • Heroine with Chinese Dress
Rating 6.5128 Users
Mugen Kairou 2 ~Rasen~
Mugen Kairou 2 ~Rasen~
29%
Tags
  • Master and Servant
  • Time Loop
  • Multiple Route Mystery
  • Paraphilic Infantilism
  • Pragmatic Heroine
Rating 6.6744 Users
Extravaganza ~Mushi Mederu Shoujo~
Extravaganza ~Mushi Mederu Shoujo~
28%
Tags
  • Choosing Factions
  • Genetic Research
  • Coming-of-Age Drama
  • Completion Status Indicator
  • Built-in Flowchart
Rating 8.08138 Users
Mugen Kairou
Mugen Kairou
25%
Tags
  • Butler Protagonist
  • Master and Servant
  • Pegging
  • Trap Protagonist
  • Multiple Route Mystery
Rating 6.7083 Users
Touka Gettan
Touka Gettan
25%
Tags
  • Simulation Game
  • Mystery
  • Fantasy
  • Fictional World
  • Brocon Heroine
Rating 7.5322 Users
-atled-
-atled-
24%
Tags
  • Orphan Heroine
  • Male Protagonist for a Short Time
  • Musician Hero
  • Time Travel
  • Musical Themes
Rating 7.0440 Users
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
MinDeaD BlooD ~Shihaisha no Tame no Kyoushikyoku~
24%
Tags
  • Choosing Factions
  • Vampire Hunter Heroine
  • Undead
  • Vampire Protagonist
  • Unarmed Combat
Rating 7.66151 Users
Mahou no Shugo Hime Artemina
Mahou no Shugo Hime Artemina
24%
Tags
  • Mahou Shoujo Protagonist
  • Loli Protagonist
  • High Amounts of Rape
  • Ponytail Protagonist
  • Insemination by Non-Humanoids
Rating 6.2925 Users
AGEHA ~EXTRAVAGANZA~
AGEHA ~EXTRAVAGANZA~
24%
Tags
  • Prison
  • Unavoidable Protagonist Rape
  • Sex with Insects
  • Unavoidable Heroine Rape
  • Heroine with Small Breasts (Non-Loli)
Rating 5.4738 Users
White Clarity
White Clarity
24%
Tags
  • Past
  • Albino Heroine
  • Unlockable Routes
  • Western-style Manor
  • Orphan Protagonist
Rating 7.2620 Users
MinDeaD BlooD ~Mayu to Mana no Yuketsubako~
MinDeaD BlooD ~Mayu to Mana no Yuketsubako~
24%
Tags
  • Duel
  • Vampire
  • Side Character Rape by Others
  • Vampire Hunter Heroine
  • Battle of Wits
Rating 6.9861 Users
Mushitsukai
Mushitsukai
24%
Tags
  • Sex with Insects
  • Scat Filter
  • Combat with Exotic Weapons
  • Consensual Sex Involving Slime Monsters
  • Symbiote / Parasite
Rating 6.6935 Users
Anonymous
Anonymous
23%
Tags
  • High Amount of Special Effects
  • Psychological Horror
  • Depression
  • Blackmail
  • Unavoidable Rape
Rating 6.9434 Users
Ookami Shoujo Reona -Yasei Houkai Hakuchi Kyouiku-
Ookami Shoujo Reona -Yasei Houkai Hakuchi Kyouiku-
22%
Tags
  • Rapist Protagonist
  • Internal Exhibition of Sex
  • Central Heroine
  • Sexual Devices
  • Object Insertion
Rating 6.6620 Users
"Hello, world."
"Hello, world."
22%
Tags
  • Future Tokyo
  • Hard Science Fiction
  • Future Japan
  • Driver Heroine
  • Hacker Protagonist
Rating 8.0090 Users
Yami no Koe Zero
Yami no Koe Zero
21%
Tags
  • Sexual Fantasizing
  • Dominatrix Heroine
  • Western-style Manor
  • Sexual Corruption
  • Group Sex of Several Females
Rating 6.7243 Users
Minagoroshi no Otome.
Minagoroshi no Otome.
21%
Tags
  • Mahou Shoujo Protagonist
  • Transfer Student Protagonist
  • Mahou Shoujo Heroine
  • Revenge
  • Protagonist with Big Breasts
Rating 6.8422 Users
Yami no Koe Ibunroku
Yami no Koe Ibunroku
21%
Tags
  • Sadist Support Character
  • Protagonist's Blood-related Brother as a Hero
  • Sexual Corruption
  • Confinement
  • Consensual Erotic Humiliation
Rating 6.4920 Users
Ore wa Shoujo Mangaka
Ore wa Shoujo Mangaka
21%
Tags
  • Comic Convention
  • Artist Protagonist
  • Tsukkomi Heroine
  • Mangaka Protagonist
  • Mangaka Heroine
Rating 7.1823 Users
Chu x Chu! On The Move ~Kenran Jikuu no Festival~
Chu x Chu! On The Move ~Kenran Jikuu no Festival~
20%
Tags
  • Musical Environment
  • Vampire Heroine
  • Idol Heroine
  • Nude Filter
  • Japanese Idols
Rating 7.0423 Users
PARA-SOL
PARA-SOL
20%
Tags
  • Future Setting in a Fictional World
  • Combat with Claws
  • Bodyguard Protagonist
  • Combat with Exotic Weapons
  • ESP
Rating 7.5580 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 7.3125 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 (67 total)

NameScoreImportanceWeight
Battle Royale3.002.597.76
Cthulhu Mythos2.602.707.02
Scat Filter2.003.386.76
Childhood Promise3.002.136.39
Extremely (un)Lucky Heroine2.003.136.26
Sex Involving Amputees2.002.945.88
Unbirth2.002.885.76
Heroine with Bodystocking2.002.705.40
Master and Servant2.332.285.31
Symbiote / Parasite2.002.635.26
Protagonist with Tentacles2.002.615.23
Plant Sex2.002.575.15
Heroine with Jeans2.002.565.12
Consensual Sex With Monsters2.002.494.98
Fighting Heroine3.001.634.90
Wet and Messy2.002.414.82
Sex with Insects2.002.394.77
Single Hole Multiple Tentacle Penetration (obsolete)2.002.364.73
Heroine with Eyepatch2.002.364.71
Imouto-type Heroine2.671.754.66
All the Way Through2.002.244.49
Guro2.002.234.47
Heroine with Heterochromia2.002.224.44
Erotic Electrostimulation2.002.224.43
Shapeshifting2.002.174.34
Villainous Heroine2.002.074.13
Futanari on Female2.002.064.12
Tentacle Rape3.001.364.09
Lesbian Rape2.002.034.06
Insemination by Non-Humanoids2.002.024.04
Monster Birth2.001.983.97
Protagonist's Senpai as a Heroine2.331.693.94
Breast Expansion2.001.973.93
Penis Growth2.001.933.87
Consensual Sex Involving Tentacles2.001.933.85
Gore2.001.913.83
Unlockable Routes2.501.493.73
Twin Sisters as Heroines2.001.823.65
Sexual Corruption2.001.763.53
Inflation2.001.763.51
Protagonist's Childhood Friend as a Heroine3.001.143.42
Scat2.001.693.38
Ojousama Heroine2.331.443.36
Excessive Semen2.001.653.30
High Sexual Content3.001.053.15
Dark Skinned Heroine2.001.502.99
Multiple Penises1.002.862.86
Sex in Water2.001.412.82
Heroine with Zettai Ryouiki2.001.392.79
Parody1.501.812.71
Mystery2.001.312.62
Lactation During Sex2.001.272.54
Ahegao2.001.252.49
Bukkake2.001.202.40
Anal Gaping1.002.142.14
Naked Sprites2.001.052.10
Trap Heroine1.002.052.05
Shota Hero1.002.012.01
Protagonist with a Face3.000.641.91
Yandere Heroine1.001.891.89
Sexual Slavery1.001.631.63
Lesbian Sex1.251.151.44
Horror1.001.431.43
Loli Heroine1.001.191.19
Male Protagonist2.250.300.68
Urination Fetish0.251.660.42
ADV2.670.140.38

Traits (150 total)

NameCharactersImportanceWeight
Non-human Role42.313.72
Tentacle Body32.613.61
Fur Trim Clothes22.452.69
Mini-dress Clothes41.632.63
Suspenders Clothes22.292.52
Heterochromia Eyes22.252.48
Gothic Clothes22.202.42
Himedere Personality13.382.35
Ankle Boots Clothes22.102.31
Flat Chest Body22.092.30
Hairpin Clothes41.402.26
Repeater Role13.232.24
Tsurime Eyes41.382.22
Miniskirt Clothes71.062.21
Straight Hair90.942.18
Thigh-high Stockings Clothes71.042.17
Multiple Eyes Eyes13.082.13
Timid Personality21.862.05
Sailor School Uniform Clothes31.482.05
Ribbon Tie Clothes41.252.01
Guide Role12.892.00
Kid Body31.371.90
Foreign Exchange Student Role12.741.90
Beanie Clothes12.721.88
Spiky Hair21.691.86
Grumbler Personality12.651.84
Garnet Eyes21.661.82
Small Breasts Body21.661.82
Capri Pants Clothes12.611.81
Loose Necktie Clothes12.611.81
Patterned Thigh-high Stockings Clothes12.581.79
Fighting Engages in31.291.79
Dog Role12.541.76
Gloomy Personality12.541.76
Childhood Friend Role31.261.74
Trench Coat Clothes12.461.71
Classmate Role31.231.70
Homeroom Teacher Role12.451.70
Ankle-Strap Shoes Clothes12.441.69
Vest Clothes21.521.67
Cigarette Items12.391.66
Smart Personality21.461.60
Shrug Clothes12.291.59
Eccentric Personality12.291.59
Foreigner Role12.281.58
Big Breasts Body31.131.57
School Uniform Clothes70.751.57
Pantyhose Clothes21.421.57
Slim Body140.581.56
Black Eyes21.421.56
Eyepatch Clothes12.251.56
Escape From Confinement Engages in12.241.56
V Bangs Hair21.411.55
Trap Body12.231.54
Tareme Eyes31.111.53
Knee-high Socks Clothes21.381.52
Pet Owner Role12.171.51
Bandages Clothes12.151.49
Sundress Clothes12.141.49
Mary Jane Clothes12.121.47
White Hair21.331.46
Insightful Personality12.101.45
Short Body12.071.43
Cross-dressing Engages in12.071.43
Amber Eyes31.031.43
Teen Body90.621.43
Docile Personality12.041.42
Smoking Engages in12.041.41
Sly Personality12.031.41
Furry Tail Body12.031.40
Neighbor Role11.991.38
Turtleneck Shirt Clothes11.991.38
Cold-hearted Personality11.951.35
Full Brother Role11.951.35
Scar Body11.951.35
Taciturn Personality11.941.35
Ring Clothes11.941.34
Old Body11.931.34
Curious Personality11.921.33
Atashi Personality11.911.32
Younger Brother Role11.901.32
Villain Role11.901.32
Violet Hair21.191.31
Ribbon Hair Tie Clothes21.191.31
Waist Length+ Hair40.811.30
Jealous Personality11.871.30
Tsundere Personality11.871.30
Rude Personality11.871.29
Blue Eyes40.801.29
Twin Sister Role11.861.29
Maid Role11.841.27
Shoulder-length Hair30.921.27
Based on a Real Person Role11.831.27
Blunt Personality11.831.27
Younger Appearance Body11.821.26
Antagonist Role11.821.26
Brown Eyes30.901.25
Braid Hair11.781.23
Long Hair40.751.21
Cheerful Personality11.741.20
Older Brother Role11.731.20
Outgoing Personality11.731.20
Mischievous Personality11.721.19
Sports Shoes Clothes11.721.19
Coat Clothes11.701.18
Hoodie Clothes11.701.18
Arrogant Personality11.701.18
Mysterious Personality11.691.17
Crop Top Clothes11.661.15
Cyan Eyes11.661.15
Collar Clothes11.661.15
Olive Body11.661.15
Popular Role11.641.13
Maid's Headdress Clothes11.621.13
Drinking Engages in11.611.12
Senpai Role11.611.12
Full Sister Role11.561.08
Older Sister Role11.561.08
Jeans Clothes11.551.08
Sidehair Hair20.981.07
Medium Breasts Body11.511.05
Maid's Dress Clothes11.511.05
Orange Hair11.511.05
Choker Clothes11.501.04
Green Hair11.481.02
Headband Clothes11.451.01
Younger Sister Role11.441.00
Tank Top Clothes11.410.98
Pale Body130.370.97
Grey Hair11.380.96
Wavy Hair11.360.94
Pink Hair11.330.92
Ahoge Hair11.320.92
Red Hair11.320.92
Curtained Hair11.300.90
Black Hair20.800.88
Dress Clothes11.250.87
Short Hair30.610.84
Young-adult Body20.760.84
Red Eyes11.200.83
Trousers Clothes11.190.82
Shirt Clothes11.160.80
Ponytail Hair11.100.76
Brown Hair20.680.75
Glasses Clothes11.080.75
Parted to Side Hair11.050.73
Kind Personality11.030.71
Green Eyes11.020.70
Spiky Bangs Hair11.000.69
Blond Hair10.890.62