Sota Nishino is a good-looking high-school student. He meets Mai, who is his friend Yukihiro Nanase's younger sister. She is also a high-school student and somewhat naïve. Sota Nishino mutters to Yukihiro Nanase, "Your sister is cute." Mai overhears Sota's remark through the thin wall between her room and her brother's.
Acting
Risaki Matsukaze's deadpan reactions to overheard chaos
Writing
Comedy mined from excruciating social situations
Director
Ryô Nakajima
Trivia, insights & behind the scenes
The 'thin wall' premise originated from a popular web novel format in 2010s Japan where overheard conversations drive romantic plots.
The title 'Anitomo' combines 'ani' (older brother) and 'tomodachi' (friend), directly referencing the taboo-adjacent dynamic that fuels the comedy.
JP
