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Summary

The main character and his friends are attending their class in a quiet academy like normal students when a UFO suddenly passes overhead. The whole academy begins to panic and a beautiful, female alien appears from the UFO. She claims she traversed vast reaches of space in order to tie the knot with Yuusaku. Meanwhile, Yuusaku is utterly confused. As she tries to press him into marriage, she uncovers his secret stash of porn and begins using knowledge of cosplay from that in order to seduce him. The other heroine, his childhood friend, joins in the fuss over Yuusaku caused by the alien’s mother, friend, rival, and even space pirates. On top of all this, secret agents from another country begin targeting the Aliens’ advanced technology… [From the Mangagamer blog]

Immoral Little DS
Immoral Little DS
NAN%
Tags
  • Mesugaki Heroine
  • Female Domination Only
  • Lolicon Protagonist
  • Twin Footjob
  • Only Loli Heroines
Rating 6.6834 Users
Ecchi na Bunny-san wa Kirai? 2
Ecchi na Bunny-san wa Kirai? 2
NAN%
Tags
  • Bunnygirl Cosplay
  • Co-worker Heroine
  • Waitress Heroine
  • Heroine with Tights
  • Cafe
Rating 5.98491 Users
Boku no Maman Sagashi ~Mama o Tazunetara... 8nin no Kyonyuu Tsuma Deshita~
Boku no Maman Sagashi ~Mama o Tazunetara... 8nin no Kyonyuu Tsuma Deshita~
NAN%
Tags
  • More Than Seven Heroines
  • Non-blood-related Mother/Son Incest
  • Protagonist's Non-blood-related Mother as a Heroine
  • Consensual Group Sex of One Female and Several Males
  • Prostitute Heroine
Rating 6.4931 Users
Let
Let's la Go! Bokura no Jiyuu Kenkyuu
NAN%
Tags
  • Lesbian Lolicon
  • Shota Protagonist
  • Straight Shotacon
  • Shotacon
  • Exhibitionism
Rating 6.7138 Users
Sex Anime Online
Sex Anime Online
NAN%
Tags
  • Title Parody
  • Fan-fiction
  • Scenario Selection
  • Fantasy
  • Nukige
Rating 6.1421 Users
Reizoku no Majo April ~Injoku no Mahou Choukyou~
Reizoku no Majo April ~Injoku no Mahou Choukyou~
NAN%
Tags
  • Fairy Heroine
  • No "Keep Voice on Click" Option
  • Built-in Flowchart
  • Witch Heroine
  • Heroine with Visible Panties
Rating 5.56495 Users
Kuronijibon 2
Kuronijibon 2
NAN%
Tags
  • Mother Support Character
  • Heroine with Psychological Problems
  • Cousin Incest
  • Anthology
  • Cousin Romance
Rating 6.7425 Users
Harem☆Party
Harem☆Party
NAN%
Tags
  • Royal Heroine
  • Clumsy Heroine
  • Sex Under the Necessity
  • Tall Heroine
  • Heroine with Armor
Rating 5.88589 Users
Ore ga Shujinkou ~Naka ni Haitte Ore ga Dasu!~
Ore ga Shujinkou ~Naka ni Haitte Ore ga Dasu!~
NAN%
Tags
  • Sexual Scenes with Gameplay
  • Otaku Protagonist
  • Angel Heroine
  • Stereoscopic
  • Realtime 3D
Rating 6.1047 Users
Watashi ni Kon
Watashi ni Kon'ya Ai ni Kite 2 ~Oyome-san wa Hime Miko~
NAN%
Tags
  • Shinto Shrine
  • Heroine with Baby Complex
  • Miko Heroine
  • Widow Heroine
  • Yamato Nadeshiko Heroine
Rating 6.07473 Users
Shoujo Mahou Gaku Little Witch Romanesque Bangai Hen "Sayonara, Mauresumo"
Shoujo Mahou Gaku Little Witch Romanesque Bangai Hen "Sayonara, Mauresumo"
NAN%
Tags
  • Ghost
  • Floating Textbox
  • Past Setting in a Fictional World
  • Comedy
  • No Romance Plot
Rating 6.4321 Users
Shojo Mama
Shojo Mama
NAN%
Tags
  • Non-blood-related Mother/Son Incest
  • Futanari on Male
  • Clumsy Heroine
  • Domicile
  • Cross-dressing
Rating 6.2420 Users
Seitenkan ~Ore no Naka de Ikeba Ii Daro!?~
Seitenkan ~Ore no Naka de Ikeba Ii Daro!?~
NAN%
Tags
  • Genderbent Sex
  • Sex Change
  • Blood-related Sister/Sister Incest
  • Promiscuity
  • Flat Tints Only
Rating 5.51211 Users
Binetsu Kyoushi Cherry
Binetsu Kyoushi Cherry
NAN%
Tags
  • Student-Teacher Romance
  • Daydreams
  • Reverse Netorare
  • Perverted Friend
  • Clumsy Heroine
Rating 6.18607 Users
Tsuma Youji 2 ~Boku wa Hitozuma Tenjouin~
Tsuma Youji 2 ~Boku wa Hitozuma Tenjouin~
NAN%
Tags
  • Driver Heroine
  • Guide Heroine
  • Landlady Heroine
  • Onsen
  • Co-worker Heroine
Rating 7.1421 Users
Minna de Nyan Nyan
Minna de Nyan Nyan
NAN%
Tags
  • Heroine from a Different World
  • Kemonomimi Support Character
  • Doggirl Heroine
  • Rabbitgirl Heroine
  • Landlady Heroine
Rating 5.78581 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
Kougyaku no Kishi Milles -Boukyaku no Hate, Inshoku Jutai-
Kougyaku no Kishi Milles -Boukyaku no Hate, Inshoku Jutai-
NAN%
Tags
  • Unavoidable Rape
  • Plant Sex
  • Third-person Narrative
  • Heroine with Visible Panties
  • Slime Monster Rape
Rating 5.03156 Users
Gibo no Milk wa Mitsu no Aji ~Ippai Nonde, Amaete ne~
Gibo no Milk wa Mitsu no Aji ~Ippai Nonde, Amaete ne~
NAN%
Tags
  • Non-blood-related Mother/Son Incest
  • Adult Breast Feeding
  • Only Protagonist's Relatives as Heroine(s)
  • Netori
  • University Student Protagonist
Rating 6.4520 Users
Ecchi na Bunny-san wa Kirai?
Ecchi na Bunny-san wa Kirai?
NAN%
Tags
  • Usamimi Heroine
  • Heroine with Leotard
  • Bunnygirl Cosplay
  • Waiting Staff Protagonist
  • Co-worker Heroine
Rating 5.88557 Users
Boku no Mesu Hisho wa Doukyuusei
Boku no Mesu Hisho wa Doukyuusei
NAN%
Tags
  • Sexual Slavery (Consensual)
  • Unavoidable Rape
  • Wealthy Protagonist
  • Rapist Protagonist
  • Timid Heroine
Rating 5.61376 Users
Neko Kawaigari! ~Crane Inuneko Byouin Shinsatsuchuu~
Neko Kawaigari! ~Crane Inuneko Byouin Shinsatsuchuu~
NAN%
Tags
  • Health Issues
  • Heroine with Health Issues
  • Kemonomimi Protagonist
  • Medical Doctor Heroine
  • Glasses Option
Rating 6.6481 Users
Mazo x Love
Mazo x Love
NAN%
Tags
  • Comic Convention
  • Comedy Rape
  • Mangaka Protagonist
  • Police Officer Heroine
  • Heroine with Inverted Nipples
Rating 7.5423 Users
Anata no Osanazuma
Anata no Osanazuma
NAN%
Tags
  • Childishly Violent Heroine
  • Unlockable Harem Ending
  • Shimaidon
  • Heroine with Flat Chest (Non-Loli)
  • Reverse Rape
Rating 5.63370 Users
Magical Teacher Sensei wa Majo?
Magical Teacher Sensei wa Majo?
21%
Tags
  • P.E. Teacher Heroine
  • Blood-related Aunt/Nephew Incest
  • Principal Heroine
  • Mage Protagonist
  • Shotacon Heroine
Rating 5.39249 Users
Succubu ☆ Soon!
Succubu ☆ Soon!
14%
Tags
  • Incubi
  • Succubi
  • Protagonist's Rival as a Heroine
  • Only Avoidable Heroine Having Sex with Others
  • Nun Heroine
Rating 5.40375 Users
Binetsu Kyoushi Cherry
Binetsu Kyoushi Cherry
14%
Tags
  • Student-Teacher Romance
  • Daydreams
  • Reverse Netorare
  • Perverted Friend
  • Clumsy Heroine
Rating 6.18607 Users
Seitenkan ~Ore no Naka de Ikeba Ii Daro!?~
Seitenkan ~Ore no Naka de Ikeba Ii Daro!?~
13%
Tags
  • Genderbent Sex
  • Sex Change
  • Blood-related Sister/Sister Incest
  • Promiscuity
  • Flat Tints Only
Rating 5.51211 Users
Shojo Mama
Shojo Mama
13%
Tags
  • Non-blood-related Mother/Son Incest
  • Futanari on Male
  • Clumsy Heroine
  • Domicile
  • Cross-dressing
Rating 6.2420 Users
Watashi ni Kon
Watashi ni Kon'ya Ai ni Kite 2 ~Oyome-san wa Hime Miko~
13%
Tags
  • Shinto Shrine
  • Heroine with Baby Complex
  • Miko Heroine
  • Widow Heroine
  • Yamato Nadeshiko Heroine
Rating 6.07473 Users
Shoujo Mahou Gaku Little Witch Romanesque Bangai Hen "Sayonara, Mauresumo"
Shoujo Mahou Gaku Little Witch Romanesque Bangai Hen "Sayonara, Mauresumo"
13%
Tags
  • Ghost
  • Floating Textbox
  • Past Setting in a Fictional World
  • Comedy
  • No Romance Plot
Rating 6.4321 Users
Harem☆Party
Harem☆Party
13%
Tags
  • Royal Heroine
  • Clumsy Heroine
  • Sex Under the Necessity
  • Tall Heroine
  • Heroine with Armor
Rating 5.88589 Users
Ore ga Shujinkou ~Naka ni Haitte Ore ga Dasu!~
Ore ga Shujinkou ~Naka ni Haitte Ore ga Dasu!~
13%
Tags
  • Sexual Scenes with Gameplay
  • Otaku Protagonist
  • Angel Heroine
  • Stereoscopic
  • Realtime 3D
Rating 6.1047 Users
Minna de Nyan Nyan
Minna de Nyan Nyan
13%
Tags
  • Heroine from a Different World
  • Kemonomimi Support Character
  • Doggirl Heroine
  • Rabbitgirl Heroine
  • Landlady Heroine
Rating 5.78581 Users
Kougyaku no Kishi Milles -Boukyaku no Hate, Inshoku Jutai-
Kougyaku no Kishi Milles -Boukyaku no Hate, Inshoku Jutai-
12%
Tags
  • Unavoidable Rape
  • Plant Sex
  • Third-person Narrative
  • Heroine with Visible Panties
  • Slime Monster Rape
Rating 5.03156 Users
Ecchi na Bunny-san wa Kirai?
Ecchi na Bunny-san wa Kirai?
12%
Tags
  • Usamimi Heroine
  • Heroine with Leotard
  • Bunnygirl Cosplay
  • Waiting Staff Protagonist
  • Co-worker Heroine
Rating 5.88557 Users
Neko Kawaigari! ~Crane Inuneko Byouin Shinsatsuchuu~
Neko Kawaigari! ~Crane Inuneko Byouin Shinsatsuchuu~
11%
Tags
  • Health Issues
  • Heroine with Health Issues
  • Kemonomimi Protagonist
  • Medical Doctor Heroine
  • Glasses Option
Rating 6.6481 Users
Anata no Osanazuma
Anata no Osanazuma
11%
Tags
  • Childishly Violent Heroine
  • Unlockable Harem Ending
  • Shimaidon
  • Heroine with Flat Chest (Non-Loli)
  • Reverse Rape
Rating 5.63370 Users
Yarasete! Teacher
Yarasete! Teacher
11%
Tags
  • Straight Shotacon
  • School Nurse Support Character
  • Shota Protagonist
  • Perverted Protagonist
  • School
Rating 6.3331 Users
Shimai Don ~Shirudaku de~
Shimai Don ~Shirudaku de~
11%
Tags
  • No "Keep Voice on Click" Option
  • Nonsense
  • Threesome Ending
  • Shimaidon Ending
  • Protagonist's Sister-in-Law as a Heroine
Rating 4.60158 Users
Mashou no Nie
Mashou no Nie
11%
Tags
  • Mercenary Protagonist
  • Queen Heroine
  • War
  • Sexual Slavery (Choukyou Variation)
  • Heroine with Armor
Rating 6.03440 Users
Chichi Miko!! Plus 1 ~Sobo to Musume no Sakunyuu Harem~
Chichi Miko!! Plus 1 ~Sobo to Musume no Sakunyuu Harem~
11%
Tags
  • Protagonist's Grandmother as a Heroine
  • Father/Daughter Romance
  • Only Protagonist's Relatives as Heroine(s)
  • Inbred Heroine
  • Blood-related Grandmother/Grandson Incest
Rating 6.18199 Users
Dystopia ~Bougyaku no Mirai~
Dystopia ~Bougyaku no Mirai~
11%
Tags
  • Yakuza
  • Back Skip Function
  • Erotic Mind Control
  • Sex Involving Drugs
  • Lesbian Heroine
Rating 4.0722 Users
Chichi Miko!!
Chichi Miko!!
11%
Tags
  • Heroine with Grandchildren
  • Only Protagonist's Relatives as Heroine(s)
  • Shinto Shrine
  • May-December Romance
  • Heroine with Gigantic Breasts
Rating 6.20333 Users
The Guts! -Maximum Maternity!-
The Guts! -Maximum Maternity!-
11%
Tags
  • Shotacon Heroine
  • Muscular Heroine
  • Co-worker Heroine
  • Orekko Heroine
  • Protagonist's Boss as a Heroine
Rating 7.0831 Users
Goshujin-sama Da~isuki
Goshujin-sama Da~isuki
11%
Tags
  • Group (4+) Footjob
  • Wealthy Protagonist
  • Popular Protagonist
  • Nympho Protagonist
  • Bleep Censor
Rating 6.36726 Users
Kimomen Demo Kyokon nara Kokuminteki Idol Group o Harem ni Dekiru!? ~Gokujou Ma*ko o Hitorijime! Shasei Shimakuri Harama Sousenkyo♪~
Kimomen Demo Kyokon nara Kokuminteki Idol Group o Harem ni Dekiru!? ~Gokujou Ma*ko o Hitorijime! Shasei Shimakuri Harama Sousenkyo♪~
11%
Tags
  • Heroine with Gradient Colored Hair
  • Heroine with Slave Tattoo (BDSM)
  • Production of Pornography (Professional)
  • Idol Heroine
  • Triple Boobjob
Rating 6.5722 Users
Pururun Café
Pururun Café
11%
Tags
  • Divorcee Heroine
  • Martial Artist Heroine
  • Co-worker Heroine
  • Protagonist's Boss as a Heroine
  • Businesswoman Heroine
Rating 6.03605 Users

Cosutte Alien -Yuuwaku no Cosplay H- 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 (44 total)

NameScoreImportanceWeight
Sexual Cosplay3.001.835.49
Sudden Girlfriend Appearance2.002.725.44
Rabbitgirl Heroine2.202.425.33
Royal Heroine2.002.525.05
Catgirl Heroine2.601.935.03
Alien Heroine2.202.244.92
Princess Heroine2.801.764.91
Comedic Love Triangle2.002.384.76
Science Fantasy2.002.314.61
Ejaculation Choice3.001.534.59
Fictional Modern Day Japanese Town2.201.964.30
Pirate Heroine1.502.854.27
Deredere Heroine2.601.614.20
Heroine with Visible Panties1.802.103.78
Soapy Massage2.001.843.68
High School2.801.223.41
Twin Boobjob2.001.683.36
Naked Heroine with Apron2.001.663.33
Dark Skinned Heroine2.001.503.00
Balls Sucking1.501.962.94
Student Protagonist2.201.262.77
Early Sexual Content2.201.232.70
Intercrural Sex2.001.342.69
High Sexual Content2.501.052.63
Heroine with Sexual Experience2.001.222.43
Cosplay1.122.052.29
Comedy2.001.112.21
Student Heroine2.200.992.18
Protagonist's Childhood Friend as a Heroine1.891.142.16
Lots of Choices1.501.432.15
Adult Heroine1.801.142.05
Heroine with Big Breasts2.000.851.71
Cowgirl2.000.841.68
Big Breast Sizes Heroine1.171.311.53
Defloration2.000.761.52
Group Sex of One Male and Several Females1.500.921.37
Nukige2.000.651.30
Sixty-nine1.001.071.07
Multiple Endings1.500.671.00
Male Protagonist3.000.300.91
Footjob0.331.880.62
Boobjob0.331.320.44
ADV2.800.150.41
Blowjob0.331.110.37

Traits (160 total)

NameCharactersImportanceWeight
Extraterrestrial Role52.444.38
Shikomizue Items13.982.76
Space Pirate Role13.872.68
Detached Sleeves Clothes31.822.52
Body Ribbon Clothes22.222.44
Bell (accessory) Clothes22.162.37
Possessive Personality22.132.34
Old Type School Swimsuit Clothes22.092.30
Collar Clothes31.662.30
Tricorn Hat Clothes13.212.23
Paw Gloves Clothes13.032.10
Usamimi Headband Clothes13.032.10
Puffy Sleeves Clothes21.852.03
Sex in Public Places Engages in (Sexual)41.262.02
Childhood Friend Role41.262.02
Christmas Cap Clothes12.912.02
Hat Clothes21.832.01
Not a Virgin Role31.421.97
Santa Suit Clothes12.831.96
Twin Boobjob Engages in (Sexual)21.771.94
Fishnet Pantyhose Clothes12.791.94
Deredere Personality21.741.92
Garter Clothes12.711.88
Strapless Leotard Clothes12.671.85
Strapless Mini-dress Clothes12.651.84
Inferiority Complex Subject of12.651.83
Ribbon Hair Wrap Clothes12.621.82
Queen Regnant Role12.601.80
Half-Skirt Clothes12.571.78
Narcissist Personality12.551.77
Bondage Engages in12.551.76
Blindfold Clothes12.541.76
Police Officer Uniform Clothes12.531.75
Tube Top Clothes12.511.74
Naked Shirt Clothes12.511.74
Boobjob Engages in (Sexual)41.071.72
Sex in Water Engages in (Sexual)21.561.72
Bunny Dress Clothes12.461.70
Fur Trim Clothes12.461.70
Bodysponge Engages in (Sexual)12.381.65
Sceptre Items12.361.64
Student Role21.491.63
Outdoor Sex Engages in (Sexual)31.161.60
Rope Bondage Harness Clothes12.291.59
Big Breasts Body31.141.58
Intercrural Sex Subject of (Sexual)12.281.58
Name Tag Clothes12.271.57
Tabi Clothes12.261.57
Cat Role12.221.54
Bathroom Sex Engages in (Sexual)21.391.53
Handcuffed Sex Subject of (Sexual)12.161.49
Pink Hair21.331.46
Nurse's Cap Clothes12.091.45
Thigh-high Stockings Clothes31.041.44
Honor Student Role12.081.44
Short Body12.071.43
Robe Clothes12.061.43
Docile Personality12.041.42
Bow Tie Clothes12.041.42
Cuffs Clothes12.031.41
Rival Role12.031.40
Furry Tail Body12.031.40
Emotional Personality12.021.40
Vaginal Object Insertion Subject of (Sexual)12.011.39
Nurse Uniform Clothes12.001.39
Princess Role11.991.38
Vibrator Subject of (Sexual)11.981.37
Selfish Personality11.961.36
Sidehair Hair30.981.36
Miko's Dress Clothes11.941.35
Piledriver Subject of (Sexual)11.941.35
Old Body11.941.34
Antenna Hair11.931.33
Cosplay Engages in11.921.33
Beard Hair11.901.31
Straight Hair30.951.31
Blue Hair21.191.31
Fang Body11.881.30
Jealous Personality11.881.30
Naked Apron Clothes11.871.30
Group Sex of One Male and Several Females Engages in (Sexual)21.171.29
Intercrural Sex Engages in (Sexual)11.851.28
Knee-high Boots Clothes11.831.27
Moustache Hair11.831.27
Bob Cut Hair11.821.26
Hidden Eyes11.811.25
Missionary Subject of (Sexual)21.121.23
Kemonomimi Body11.771.22
Necktie Clothes21.111.22
Panties Clothes11.731.20
Footjob Engages in (Sexual)11.721.19
Sport Bloomers Clothes11.721.19
Vaginal Masturbation Engages in (Sexual)11.701.18
Naive Personality11.691.17
Spiky Hair11.691.17
Dark Body11.681.17
Carefree Personality11.681.16
Intake Hair11.671.16
Small Breasts Body11.671.15
Ribbon Hair Accessory Clothes11.651.15
Popular Role11.631.13
Amber Eyes21.031.13
Maid's Headdress Clothes11.631.13
Garter Belt Stockings Clothes11.621.12
Sex in Classroom Engages in (Sexual)11.611.11
Big Breast Sizes Body11.541.07
Cowgirl Subject of (Sexual)20.951.05
Maid's Dress Clothes11.511.05
Group Sex Engages in (Sexual)11.501.04
Sailor School Uniform Clothes11.481.03
Green Hair11.481.02
Incest Engages in (Sexual)11.471.02
Seventh Posture Subject of (Sexual)11.461.01
Mother Role11.461.01
Daughter Role11.461.01
Twin Blowjob Engages in (Sexual)11.451.00
Suit Clothes11.441.00
Teen Body40.621.00
Pantyhose Clothes11.420.99
Black Eyes11.420.99
V Bangs Hair11.410.98
Hair Tie Clothes11.410.97
Blunt Bangs Hair11.400.97
Nipple Sucking Subject of (Sexual)11.380.96
Hosome Eyes11.370.95
Tominagi Subject of (Sexual)11.360.94
Virgin Sex Engages in (Sexual)20.850.93
Bukkake Subject of (Sexual)11.350.93
Slim Body40.580.93
White Hair11.330.92
Ahegao Engages in (Sexual)11.320.92
Ahoge Hair11.320.91
Waist Length+ Hair20.810.89
Blue Eyes20.800.88
Sixty-nine Engages in (Sexual)11.260.87
Young-adult Body20.760.84
Friend Role11.200.83
Violet Hair11.190.83
Long Hair20.750.83
Trousers Clothes11.190.83
Ribbon Hair Tie Clothes11.190.83
Standing Sex Subject of (Sexual)11.180.82
Shirt Clothes11.160.80
Twin Tails Hair11.130.78
Tareme Eyes11.100.76
Brown Hair20.680.75
Quickie Fix Subject of (Sexual)11.080.75
Vaginal Fingering Subject of (Sexual)11.080.75
Miniskirt Clothes11.060.74
Parted to Side Hair11.050.73
Violet Eyes11.040.72
Green Eyes11.020.70
Spiky Bangs Hair11.000.69
Pale Body50.370.66
Doggy Style Subject of (Sexual)10.930.64
Shoulder-length Hair10.920.64
Brown Eyes10.900.63
Blond Hair10.890.62
Blowjob Engages in (Sexual)10.760.53
Short Hair10.610.42