A few years after graduating high school, I was working for a so-called black company. Just when I was getting fed up with the repetition of work and home, I got a call from my childhood friend, Seiko, asking if we could meet because she was going on a trip near my house. Seiko was my first love and is now a married woman... I decided to clear my schedule that day while suppressing my faint hope. On the day, as we were Seiko and talking about old times, she suddenly came to me with a serious face and asked for my advice. It was discovered that her husband has azoospermia, and her father-in-law is pressuring her to have a grandchild. Seiko then asked me, her childhood friend and a man Kokoro can trust, to impregnate her...