Manjogahara Imari, a popular student council president at private Kanetsugu Academy, is well-liked not only at school but also among neighbors. However, she has her own struggles. One day, after an encounter with a mysterious shrimp, strange powers begin to awaken within her. Her classmate, Mararagi Toshiaki, notices this change and introduces her to someone capable of handling such supernatural forces. That person is Yoshino, a man with extensive knowledge about shrimp. Under Yoshino's guidance, Imari attempts to rid herself of the shrimp's power. But when she visits Yoshino again, the same shrimp reappears—this time threatening her. How will Imari confront this mysterious being?