"Shiro" is a black cat who loves her family very much. She loves them so much she wants to help them out in times of need and trouble…but it’s difficult to do this if she’s just a cat. So one night, she wishes on the moon to make her able to help, and the next day, she has turned into a human girl.

Midori is a high school student of a brand new school. Elected as a member of the first student body government, Midori and the rest of the officers decide to put together a gakuen-sai--a school festival. Midori likes Akira, who happened to help her out during the election speech (she fell on stage, with some more embarrassment). She's excited about working for the festival, especially since she gets to work with Akira. She tries to be a match-maker for Mamiya-san (Mami-ryn) and Sudoh-kun during the process too.