Kohitomi is a kitten who loves her owner, Higashi Yamato. From the time he comes home to the time she goes to school is her whole world. Until she sees Yamato looking different from usual. Yamato's teacher "Kaname Shiina" is a teacher that Yamato cares about. Unable to stay in her "world," Kohitomi jumps out of her "world"! The great adventure of youth, in which the fresh pain caused by the adventure of a kitten sweetly tightens her heart, begins nowーー!