After school, Jun, Aizawa's childhood friend and a gal, naturally crashes in his room. But today, Aizawa seems unusually restless. It turns out he's made the big news: he's got a girlfriend! Hiding her own excitement, Jun unilaterally begins her lesson: "I'll teach you how to have sex so she won't leave you." Initially, no physical contact; the practical exercises are entirely imaginary. 60 seconds of air kissing, maintaining eye contact, keeping hands above the waist… Each cleared step leads to a play…