Kinoshita Mayumi♂

Mayumi, a first year student at Shintoku, is a seemingly obedient boy who is usually seen quietly standing in Azusa's shadow. His parents died in a boating accident when he was young, and he was raised by Azusa's parents, who were friends with parents, and he grew up beside Azusa and his older sister Ayumi. He has a dark past associated with growing up in the Hiura household, and his relationship with his childhood friend Azusa is a complex one that seems to mix envy, hatred, and yearning.

[From Boys' Love Game Headquarters]