Both Haru Yoshioka and Makoto Konno have moved on from past events in their lives. Now Haru is attending Makoto's high school and they quickly become best friends. But their friendship will be put to the test when, much to her shock, Haru becomes half-cat again. Now, with 3 of her old friends and a new ally, Haru's furry problem thrusts her and Makoto into their greatest adventure.

Haru Yoshioka (The Cat Returns) and Makoto Konno (The Girl Who Leapt Through Time) are two teen-aged girls who are very much alike but are separated by the dimensional fabric of the space-time continuum, until a wormhole connects their dimensions to the real world. Now they will become friends to help each other in a new world as well as help one young man accomplish his dreams.