This is a secret memory that can never be forgotten. It was a hot, hot summer event. I decided to find a place to move instead of my busy husband, and I decided to see Kirishima in advance, a real estate worker. Kirishima-kun is my classmate when I was a student ... Actually, he was my first love. Spending time alone with Kirishima made me feel like I was going back to school. Despite being tormented by the sense of sin, we cannot suppress our desires.