Despite wanting to join the local festival, Renka Ariake spends her afternoon doing cleanup duty, much to her misaki Ekuu's frustration. Ekuu confronts Renka for holding back on her real feelings, but she doesn't comment on it. Instead, she goes to the festival, where she sees her schoolmates enjoying together.
Soon, Renka and Ekuu notice that the people around them are unusual, and a magatsuhi appears, showing interest in Renka while putting her classmates in a dangerous situation. With Ekuu's advice, Renka transforms.