Yuu Tamauchi

Yuu Tamauchi is a 24-year-old average company employee living alone. Due to logistical reasons related to her school commute, it is decided that his younger half-sister, Iwase Maho, will live with him. Despite the nine-year age gap between them, Yuu treats Maho with patience and care. He is socially awkward and inexperienced with girls, but shows quiet kindness and acceptance, supporting Maho without trying to change who she is.