Mother Igarashi Jun wished for her reclusive son Yuzuru to go outside and experience the world. One day, she accidentally discovers him masturbating. In that moment, she becomes aroused by the pleasure her son's body is experiencing, and sees an opportunity to draw him out of isolation—by pleasuring his cock herself and releasing his pent-up desires. But her plan quickly unravels. Yuzuru unexpectedly confesses that he wants to have sex with her. The bond between mother and son begins to shift into something entirely different.