Koichi, who can't help but worry about his beautiful busty mother-in-law, Sumire, approaches Sumire when her father isn't around. Recently, Sumire, who has been frustrated by her father's work, feels sensitive when Koichi touches her breasts! ! Fascinated by Sumire's big breasts, Koichi can't stop getting excited and has a relationship with her mother-in-law... Since then, the two of them, who hide from their father and continue their relationship, are drowning in a forbidden relationship.
