A mother and child alone in a house where her husband is absent. Son Yoshio who secretly fantasizes about his mother-in-law Megumi. I fantasize about Megumi getting entangled with two friends and being violently disturbed, sneaking into my mother's bedroom and secretly caressing... However, Megumi was also conscious of Yoshio as a man. Eventually, the feelings of the two people who intersect cross a line that should not be crossed.