Koiwai Yuba

Housewife Yuriko and her husband Fuyuki appears to be a happy couple. But in reality, Fuyuki's love towards his wife is far from being "normal". He is extremely possessive and manipulative. When Fuyuki's mother suddenly passed away, Akira, Fuyuki's younger brother, moved into the couple's house and began to notice the bruises on Yuriko's body…

"I've never thought of you as my sister." Then, a brother's lips brushed against those of his sister...Haruichi, who is two years older than his sister Natsumi, is the kindest, the coolest, and the bestest older brother one could ever have. It's easy to be jealous of how well they get along, and yet... the balance between the two begins to crumble as Natsumi starts her first year of high school.Haruichi is jealous of his friends getting closer to his sister, and Natsumi is angry at her brother for having a lover that looks strangely similar to her...With their hearts and minds whirring, they will share a night that could take them beyond mere siblings...