Shishi mo Kobamazu
64 / 100 on AniList 7.07 / 10 on MyAnimeList
Romance
Yuzuru, a yankee with a mean face, requests Satomi, his senpai, to "make him his little brother" in order to repay him for helping his family when they had money issues. Yuzuru then starts to follow Satomi around and… Synopsis via AniList