Souta, who lives with his mother, is visited by his mother's widowed sister Hono, who has returned home with her son. As Souta is beginning to understand things, he is immediately awakened by his evil feelings when he sees Hono for the first time in a long time. Taking advantage of his position as her nephew, Souta touches and indulges in Hono's body as if she were his own son. His indulgence escalates, and he even reaches out to her voluptuous breasts and buttocks. Hono's body, which has not been touched in a long time, begins to heat up unintentionally, and the two engage in a forbidden affair. Souta's repeated advances gradually make Hono so engrossed that she starts to shake her hips of her own accord...