Nao-chan, who usually works as a swimming instructor, is a Hiroshima girl who has just moved to Tokyo and has a somewhat loose air about her. She looks cute but a little unfashionable, which makes her seem like a girl who hasn't been completely absorbed into the city, so she's quite approachable, but her true identity is a precocious natural bitch. She has no objections to appearing in AV, so she came to have sex as a detour after work.