Suzuki is always hanging out with his good friend, Kawasaki.One day, Ai, who is unrequited love, came to Suzuki's house.Kawasaki says, "The three of us will have a study session."That night, Kawasaki and Ai stay at Suzuki's house.At midnight, Kawasaki, who should have been sleeping next to her, is gone.When he looks for Kawasaki, he sees him in the next room doing lewd acts with Ai...Contrary to her neat and clean look, Ai was a female student who was full of sexual curiosity.