Author gave up on any reasoning or last remnants of realism. Somewhat important S&M show with bunch of foreign guests invited random highschool boy for lead performance, and suddenly, after only few previous attempts, he can do it perfectly. Famous erotic model took a job of fuckin school nurse, in Okinawa, at the same school. And all of this on top of the garbage drama. Well, It's too late to drop this trainwreck now.
Mangaka should either stick to softcore porno, comedy etc without all this "dramatic" bullshit, or make it at least bit serious.