Nini, the adorable little demon, lives in Unit 1031 of All Saints Street Apartment with a group of unique flatmates. Among them are Ira, a lazy vampire obsessed with gaming and television, as well as Vladimir, a werewolf dancer with a streak of bad luck. Their landlord, Lynn, is a pragmatic angel, and his naive little sister, Lily, also shares the space. Despite his lovable exterior, Nini possesses the powerful ability of the demon king. Now, as malevolent forces close in on him, can he and his newfound friends avoid disaster?