Mio is a beautiful woman who moves in next door to Shohei, who is a part-time worker. She is an unconventional woman who usually goes around without underwear or a bra. What's more, she seems to be the daughter of the landlord of the apartment building where Shohei lives, and knows everything about Shohei... Shohei, who used to work at an osteopathic clinic, is asked by Mio to give him a massage, but before long the treatment extends to Mio's crotch, where she is not wearing any underwear...