Kokonoe is a werecat – a human who morphs into a cat when he is excited. Destiny has it that one morning, Kokonoe runs into Natsume, who seems to have a special relationship with cats. With Natsume's touch, Kokonoe soons finds himself purring and getting excited. However, Kokonoe is determined to keep his cat side and the feelings he has for Natsume under control.
