After school, a school girl, Ai, is taken to a certain place by her best friend, Shuri. A middle-aged man in the room. Shuri straddles the man's knees and kisses the man without hesitation. While showing Ai surprised by the sudden behavior of her best friend, Shuri invites "Let's kiss Ai together". Ai refuses, "I can't do it," but while being shown the rich kisses of the two, she was lustful and felt her crotch getting wet. And Ai who feels a special act of being blamed by two people with the addition of a middle-aged man.