Yuka is young woman who serves as the "mother" figure of those living in the Maple House in Kamakura. She's Kouta's cousin and in unclear romantic relationship with him. She's extremely jealous and will hit or slap him if she catches him in suspicious situation with any of the girls living in the house (especially Nyu) She's the one who cooks for the people living in the house, takes care of Nyu, and prevents her from doing unwanted things, such as breaking things and other naughty manners 🌚