Sex ed never truly ends! Neither sex nor education are simple binaries, and Naoko Tsuji realizes she still has a lot to learn! Even for a sex ed specialist, it's difficult to translate her own advice to real life --how should she handle her sexuality and her feelings for her coworker? As the school culture festival unfolds, Moriya, Kashiwa, and Matsuda conceive a plan to give their lovestruck instructor some extracurricular help. In this last lesson, the students become the teachers!