Ruri, a mother-in-law who lives with her husband's stepchild Yoshio in a house where her husband is away from home. Lately, I've been wondering about Yoshio's gaze. I am confused because I am conscious of him as a man. On the other hand, Yoshio was delusional about Ruri writhing while being indecently violated by her classmates. The forbidden feelings of the two are connected, and the son who finally throws everything into the heart of his kind mother...