And she found her family――. The author of 'Vampire-chan x Kouhai-chan' enters a new realm!! One day, OL Isemimi Koharu (いせみ こはる) and her living arrangement with the monster cat Hina is suddenly interrupted by a girl claiming to be Hina's older sister……. What are the painful memories Koharu holds regarding her family, and what shocking truths are tied to the monster cat――? A healing story questioning the meaning of "family" featuring a clumsy woman and a monster cat girl.