On her first day after transfering to a new high school, Shion stands up in front of Satomi, a loner in the class, and starts singing as though in a musical, proclaiming she will make Satomi happy. In addition to being smart, talented in sports, and having a cheerful attitude, Shion also quickly becomes a popular girl in her class. However, despite Satomi's demands that she stop singing, Shion can't help herself. Shion often ends up involving Satomi and other classmates in various incidents at the school. Her wild actions don't just start changing Satomi, but moving all her classmates..

Shion

Voice Actor: Tao Tsuchiya

An odd transfer student who often breaks into song. She’s good at studying and is great at sports, so she instantly becomes popular in class. She is trying to use her singing to help her lonely classmate Satomi become happier.

Satomi

Voice Actor: Haruka Fukuhara

A high school student with a serious personality. Raised in a single-mother household, she does her best to help with chores and support her mother. She’s very mature but has difficulty opening up to others. A certain incident at school made her close herself off.

Touma

Voice Actor: Asuka Kudo

Satomi’s childhood friend and a member of the electronics club at school. He’s obsessed with machines to the point that he puts actual researchers to shame. He has feelings for Satomi, but can’t bring himself to tell her.

Gocchan

Voice Actor: Kazuyuki Okitsu

Aya

Voice Actor: Mikako Komatsu

A confident girl in Satomi’s class. She is going out with Gocchan, but apparently things aren’t going well lately, and she gets jealous whenever he talks to other girls.

Sander

Voice Actor: Satoshi Hino

A member of the judo club. He trains with more passion than most but has yet to win any matches. He is curious about the new transfer student Shion.