松泽环出生于一个富裕家庭，在她就读的大小姐学校里享有极高的地位。父亲的公司破产后，她的生活发生了翻天覆地的变化，但她难以向朋友说出实情。就在这时，她被同学新岛玛利亚敲击和太鼓的声音所吸引。玛丽亚因交通事故导致声带受损，无法正常说话，因此和太鼓成了她的语言。从那之后，环也迷上了和太鼓，并在与和太鼓社团一同成长的过程中渐渐打开了心房。本片改编自漫画《和太鼓少女》，描绘了与周围格格不入的青春期少女因“声音”而相遇的故事。

A group of strangers come together to work on creating the greatest anime series ever.

One night in Tokyo, Leo, a young boxer, meets his first love, Monica, an imprisoned sex worker. Caught up in a drug-smuggling scheme, they find themselves pursued by a corrupt cop, a yakuza, his nemesis, and a female assassin.

The story of a would-be actor, his larger-than-life classmate and their friends. Unfolding their past and present, Sasaki in My Mind looks head-on at adolescent sparkle and the pathos of bygone days.