ねぇ、もういっそつき合っちゃう？幼馴染の美少女に頼まれて、カモフラ彼氏はじめました (Associated Names)

Masaichi Mazono, an otaku boy, and Toiro Kurumi, the most beautiful girl in school, are childhood friends. Toiro, who was always in Masaichi’s room, was supposed to be like family to him. But one day, Toiro, who was constantly getting annoyed by her romantic troubles, asks Masaichi to play the role of her boyfriend. They…