Brother’s Wife ~My Sister-in-Law is Mine~ [Kaminazuki Seisakusho]

Synopsis

Takumi is a ronin student living with his parents and older brother. Having always been compared to his accomplished brother, he harbors a deep complex about it.

When his brother marries and moves in with his wife Ayumi, a beautiful woman, Takumi’s inferiority complex only deepens. As a ronin student, he feels increasingly out of place in his own home.

Ayumi treats Takumi like a child, completely dismissing him.

One day, their parents go on an overseas trip to celebrate their father’s retirement. With them away, Takumi becomes distracted by the sounds of his brother and Ayumi’s intimate activities at night, making it impossible to focus on studying.

Returning home early from cram school one afternoon, Takumi finds Ayumi’s shoes at the entrance. When no one answers his greeting, he heads to the kitchen out of curiosity. Opening the door quietly, he discovers Ayumi pleasuring herself with a vegetable while still wearing her apron…