[ZUKO-015] We had an orgy on the way home from the international school. (Censored)

Picking up "ordinary" half girls who go to an international school and bringing openness to Gonzo. Sex progresses secretly in other rooms, and when they are gathered in one place, an orgy wrapped in confusion and surprise begins. Half-sans who lose their words to their first experience in their life, but gradually become confused by worldwide sexual activity that does not use condoms.