Sora is a primary school student when her favorite childhood friend, Hazuki, decides to come over to stay with her. Also, Sora's parents are going on a long business trip, so she and her Hazuki "Onee-chan" are going to start living together! Sora is excited, but something is wrong with Hazuki... She is possessed by a monster cat! Against Hazuki's will, the monster cat tries to kill Sora! But somehow, she falls in love with Sora...? How did this happen? A sweet story about the everyday life of them living together under one roof! (Source: Akita Shoten, translated)