"I'll die with you. Promise." In her second year since she started working, Kaede Yoshino has hit her limit, feeling completely burned out from working every day. Then, on the worst day of her life, under a beautiful moonlit sky, a totally wasted Kaede picks up a warm, black haired, fluffy...boy who's like a cat?! As "Hana-kun" claims he has no home to go back to, they end up living together on a temporary basis. However, in doing so, Kaede starts to realize how it warms her heart to live with someone. Then, a certain event leads to a shocking revelation of who Hana-kun really is...?! A clingy, good-for-nothing boy meets a tender-hearted overworked girl in this deadly romance?!