Mayu was standing in the kitchen wearing a sailor uniform and an apron, preparing breakfast. She served miso soup for her father and went to wake her brother, getting everything ready for the family meal. Meanwhile, her father was watching her from the bathroom as she took a shower, increasingly fascinated by her maturing body and observing her every day. At the same time, her brother sneaked into Mayu's room, opened her dresser, took out her panties, and sniffed them—arousing himself through this forbidden act.