Edit This one and the final chapter kinda underperformed in sales and I guess his fans were losing interest. On the other hand his Saki doujin tank sold well so it's just fans having this series fatigue.
honestly, I am not surprised that the later chapters of this series is under-performed in sales compared to the earlier chapters. I feel the author losing the female lead character's and it slowly become a mere bimbo-cheating series.
Meanwhile the nodoka's series still have the reason of what the fans (or at least me) like from author's stuff. the tug of war between purity and sensuality inside the fmc's mind and body.