"It's been a while since I've had sex, I'm graduating," a manga aimed at adult women, was adapted into a hugely popular TV anime (with a live-action sequel) under the title "Adults don't know how to fall in love!" Is "impulsive behavior" even permissible a second time? Mio is deeply hurt by her reunion with her ex-boyfriend. Majima, struggling to think of what to say to her, simply embraces her tenderly and gives her a gentle kiss... and the two of them...