A young couple and his wife's sister live in a housing complex. When her wife becomes suspicious of the relationship between her husband and her sister, she falls into an unexpected trap.

Exhausted from searching the city for his missing wife, Kyōhei stumbles into a small bar and falls into a dangerous affair with a mysterious woman named Miwa. A snake tattoo coils around her thigh — a mark of a past she can’t outrun. Then, one day, Miwa reveals she knows where Kyōhei’s wife is… but the truth may be more than he bargained for.

A virginal vocational student who is curious about sex is educated by her more experienced classmate.