After losing his job and being kicked out of his home, Keita moves in with his brother and sister-in-law Riho until he can find work. With no place where he feels welcome and his brother constantly mocking him for still being a virgin at 30, Keita asks Riho to grant his greatest wish and take his virginity. She feels sorry for him and agrees to let him have her just briefly, but the instant he enters her, an electrifying rush of pleasure overwhelms them—and she soon finds herself craving more sex and repeated creampies.