After school, Ai, a high school girl, is taken to a certain place by her best friend Shuri. There is a middle-aged man in the room. Shuri straddles the man's lap and kisses him without hesitation. Ai is surprised by her best friend's sudden action, but Shuri invites her to join in, saying, "Ai, come and kiss me too." Ai refuses, saying, "I can't," but as she watches the two of them passionately kiss, she becomes aroused and feels her crotch get wet. Then the middle-aged man joins in, and Ai feels a special sensation as she is dominated by the two of them.