Yandere Onee-chan no Otouto Shiiku Nikki


TitleYandere Onee-chan no Otouto Shiiku Nikki
Original titleヤンデレお姉ちゃんの弟飼育日記
LengthShort (2 - 10 hours)
Publishers Heat-Soft


The main character lives with his two sisters, Isora and Sakuya. He has recently finished high school, and is preparing to go to college. To do this, he’s planning to move out and go into the city. However, his sisters don’t want him to, and they say that there’s a college right nearby that he can go to. However, he insists, saying that he needs to grow as a person, and to do that he needs to get out of his comfort zone and try new things.

However, his sisters really, REALLY don’t want him to leave. So they do something incredibly ridiculous, yet also incredibly effective:
They divide his room in two with iron bars and a jail cell door. They do this while he is asleep.

Now, he’s locked in his bedroom, and he can’t get out. He literally can’t get out, the windows are barred, the room is barred, everything is barred. It’s a miniature jail and he’s on the inside of it. Isora visits him and informs him of something: They’re both in love with him. Not the brother-sister kind of love. REAL love. They were going to confess to him, but he decided to move away, and they just can’t have that, can they? So they built him a cage and locked him in it. They’re going to take care of him for the rest of his life, and they can all have "fun" together. Thus, the translated title of the game: "Yandere Big Sister’s Brother-Raising Diary".

[Edited from Dark Eye Translations]

Main characters

Ariake Isora
Ariake Isora有明 いそら 
AliasesSora-nee, そら姉
Hair, Black, Sidehair, Straight, V Bangs, Waist Length+
Eyes, Red
Body, Average Height, E+ Cup, Pale, Slim, Teen
Clothes, Blouse, Garter Belt Stockings, High Heels, High Heels Boots, Miniskirt, Nurse's Cap, Nurse Uniform, Panties, Pantyhose, Pendant Necklace, Sports Jersey, Thigh-high Stockings, Veil, Wedding Dress
Items, Stethoscope
Personality, Brocon, Low Self-esteem, Pessimist, Watashi, Yandere
Role, Domestic Partner, Full Sister, Nurse, Older Sister, Twin Sister
Engages in, Attempted Homicide, Confinement, Cooking, Suicide Attempt, Wedding
Subject of, Attempted Homicide, Delusion, Pregnancy
Engages in (Sexual), Ball-cupping, Blowjob, Bondage Sex, Facesitting, Group Sex, Handjob, Inbreeding, Incest, Intercrural Sex, Lesbian Sex, Sex in Public Places, Sixty-nine, Tribadism on Penis, Twin Blowjob, Twin Boobjob, Virgin Sex
Subject of (Sexual), Anal Sex, Cowgirl, Cunnilingus, Hidden Vibrator, Missionary, Pink Rotor, Reverse Missionary, Reverse Spitroast, Strangulation Sex, Tominagi, Vibrator
Voiced byKinohara Sayaka


Isora is the older sister. Her gimmick is this: she hates herself. She hates herself so deeply that it’s ingrained in her. She compares herself to things like gum stuck on the sidewalk and pigs in pens. She legitimately thinks that anything good that happens to her must have an ulterior motive, and that she deserves everything bad that happens to her.

[From Dark Eye Translations]