御園 望海

She is the tomboyish older sister next door.

She and her mother Chie argue a lot, but they get along well. She acts like a big sister to the main character, whom she has known since childhood. She hates men, but she only allows herself to be affectionate with the main character.

She is convinced that the protagonist is not capable of being a volleyball coach, but in reality she doesn't like it when the MILFs on the team bother the protagonist.

She pretends to be a big sister, but she has never been in love and is a virgin, so she doesn't know what to do. In fact, she has a maidenly personality and wants the protagonist to take the lead.