In their second year of marriage, he still loves Shihori, but things have become stale. He confesses his desire for NTR, but is rejected... He encourages his younger brother, who has feelings for Shihori, to cuckold her, and decides to install a hidden camera and spy on her while on a business trip. He sets up NTR just for fun, but is excited by the expression on his wife's face as she is tormented by guilt and pleasure after another man's dick is inserted into her. However, he is impatient with the two of them devouring Kokoro in earnest, but it is too late... In just three days, he has to watch with his fingers in his mouth as his wife becomes his younger brother's...