Yui, a mother who is passionate about education, found a hidden folder in her son's computer, which contained a large number of erotic anime images. Yui suspects that she isn't interested in real women, and tries to explore his propensity using her own body. Entering the bathroom with her son, she shows off her naked body and pubic area while washing. My son who is erecting while pretending not to see it. Yui sets up a further provocation to it. The room is gradually wrapped in a strange atmosphere.
