Details

Yuji has just returned from a trip with his father. What he saw was a lascivious spectacle of his brother and mother-in-law, Riho, who remained at home and became obsessed with each other. Having secret feelings for Riho, he becomes jealous and presses Riho for a relationship. Riho reluctantly accepts him with a one-time promise, but even after that, he comes to be asked for his body everywhere in the house.