In her fifth year of marriage, 24-year-old married woman Ryo confesses she's about to betray her husband for the first time. Today, her heart races and she can't bring herself to look her husband in the face. He notices, saying, "Your face is red—do you have a fever?"—unusually kind and attentive today, making her heart ache and her resolve waver. Yet, contrary to her feelings, she finds herself naturally smiling—a smile she's never shown him before. Being drawn to someone other than my husband... I'm sorry, honey. I'm off to get fucked now.