マイ・ボーイフレンド

A high school girl named Rio gets nicknamed "Maru" by the boy seated in front of her, Miyaji, on the first day of school because of her round forehead. This small interaction quickly leads to the two becoming close friends. Their bond grows rapidly as they spend more time together in everyday school life. Maru experiences her first boyfriend through this developing relationship. The focus remains on the sparkling, joyful moments of young romance between them. (Unreviewed summary by Grok 4.1)