Phantom Mother Forbidden Mother and Child Swap Friendly Neighborhood Erotic Mama's Radical Sex Education Course

The Yuki family and the Kirioka family are close family members. One day, Kota, who was suffering from ED, consults Satsuki, who has a lot of experience. Kouta is surprised by Satsuki's unexpected acceptance of ``Leave it to me!'', but he can't help but wonder what kind of treatment she will give him from then on. Meanwhile, Satsuki's son Kenji also happens to witness Misa, a good friend of his, masturbating... The relationship between the four people, who thought they were just good neighbors, was fraught with complicated feelings, but before they knew it, it developed into a forbidden mother-child swap...