Mitsuki, my classmate in high school, was my first love. I was attracted to her because she seemed pure and quiet, but I couldn't confess my feelings to her. She was also going to the reunion. I was Kokoro- but then she said something shocking to me, this mature and sophisticated girl: "Next time I'll have had sex with 100 men." That innocent girl had lost her virginity and become a slut! What's more, she started having creampie sex with my best friend right in front of me... I got a depressed erection when I saw that.