Imouto no Seiiki


Imouto no Seiiki
TitleImouto no Seiiki
Original title妹のセイイキ
LengthShort (2 - 10 hours)
Publishers feng
 1CH Hanhuazu & Lianzhong Hanhuazu
Alternative version
Gakkou no Seiiki
Kanojo no Seiiki


This is the second title in feng’s low-price Seiiki series, focusing on younger sister Yukana Nase.

When Youhei was small, he used to visit Akiba often. Even though it was for his younger sister Yukana, he soon got hooked on game centres and that’s how he became friends with his ojou-sama classmate Fuyuka. One day, Fuyuka gifted Yukana with a Christmas trip and the siblings enjoyed their time alone together like a couple. Looking at his younger sister, he realized that still hasn’t saved her from that time.

“You won’t let your younger sister take your virginity even though you’re into Akiba stuff… I hate you, onii-chan!”

[From Hau~ Omochikaeri!]

Main character

Nase Yukana
Nase Yukana名瀬 ゆかな 
MeasurementsHeight: 161cm
Hair, Brown, Bun, Intake, Sidehair, Twin Tails, V Bangs, Waist Length+
Eyes, Hazel
Body, Average Height, E+ Cup, Pale, Slim, Teen
Clothes, Bikini, Clothing with Ribbons, Hair Flower, Hairpin, Kimono, Knee-high Socks, Loafers, Miniskirt, Naked Apron, Naked Ribbon, Off-The-Shoulder Shirt, Pajamas, Ribbon Hair Tie, Sailor Suit, School Uniform, Thigh-high Stockings
Items, Mobile Phone
Personality, Atashi, Brocon, Modern Tsundere, Pervert
Role, Domestic Partner, Full Sister, Middle School Student, Younger Sister
Engages in, Cooking, Flirting, Graduation, Swimming
Engages in (Sexual), Blowjob, Bodysponge, Boobjob, Deepthroat, Discreet Phone Sex, Female Ejaculation, Handjob, Incest, Masturbation, Outdoor Sex, Peeing, Sex in Public Places, Sex in Water, Sleep Sex, Virgin Sex
Subject of (Sexual), Anal Fingering, Anilingus, Boobs on Glass, Butterfly, Cowgirl, Nipple Sucking, Quickie Fix, Sitting Sex, Spoons, Standing Sex, Vaginal Fingering
Voiced byAkino Hana


Yohei's younger sister. She is a third year middle school student who looks forward to attending high school with her brother next year.

Desperately in love with her brother, Yohei, despite being embarrassed by it. Her love for her brother causes her to act sweet to him sometimes while her embarrassment causes her to become angry at him at other times.

Side characters