Reira, Seika and Mito, who have been living in the residential complex together since childhood, are clattering up and down the stairs! The stairs that used to seemed so big for them are just normal under their feet now. Some things have changed, but the three of them haven't. They are still friends even now...!
Leika, Seika and Mito have lived together in this apartment complex since they were little and always loved racing up and down the stairs! Those steps felt so huge before, and now they walk them so easily. The world may get smaller, but their friendship keeps growing!