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)
Shops» JP¥ 4070 @ DLsite (jpn)


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]

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Main characters

Ariake Isora有明 いそら
AliasesSora-nee, そら姉
HairBlack, Sidehair, Straight, V Bangs, Waist Length+
BodyAverage Height, Big Breast Sizes, Pale, Slim, Teen
ClothesBlouse, High Heeled Boots, High Heels, Miniskirt, Nurse's Cap, Nurse Uniform, Panties, Pantyhose, Pendant Necklace, Sports Jersey, Thigh-high Stockings
PersonalityBrocon, Low Self-esteem, Pessimist, Watashi, Yandere
RoleDomestic Partner, Full Sister, Nurse, Older Sister, Twin Sister
Engages inConfinement, Cooking
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]

Ariake Sakuya有明 咲耶
AliasesSaku-nee, さく姉
HairShoulder-length, Sidehair, V Bangs, Violet, Wavy
EyesGarnet, Tareme
BodyAverage Height, Big Breast Sizes, Pale, Slim, Teen
ClothesCeremonial Japanese Clothing, Flip-flops, Furisode, Kanzashi, Kimono
PersonalityBrocon, Energetic, Naive, Yandere
RoleAntagonist, Domestic Partner, Full Sister, Middle Sister, Twin Sister, Yamato Nadeshiko
Engages inCleaning, Confinement, Cooking, Gardening, Teasing
Subject ofTeasing
Voiced byMahilo


Sakuya is the other sister. Her schtick is that she’s a very naïve person: she doesn’t know much about the world, but she knows a hell of a lot about flower-arrangement and being a good wife.

[From Dark Eye Translation]