Shounen ga Otona ni Natta Natsu (OVA 2024) - MyAnimeList.net

4.5/5

Reiko is depicted as a "Genius Slob"—highly intelligent but unkempt in her daily life. Her transformation into "Kirill" serves as a radical escape from her professional and familial pressures.

Ryuuki's older sister. Described as a chemical genius, she raised Ryuuki after their parents passed away before relocating to Tokyo for her career, leaving Ryuuki isolated for the summer. Themes and Tone