Besides the typical blackmail plot (MH gets drugged and raped and blackmailed with it) it annoys me how useless MH's friends are. She gets drugged and taken away by a suspicious man and they are like "meh whatever". In his other works at least you can explain characters being dumb because they were under mind control.
They aren't her friends, just coworkers. They don't care about her, she was sent there just for one month and then will return to her city. You could even say they are closer to him than to her since they know him better... I think people not minding other people's business is something you see often in real life, sadly
Not a master piece but erotic enough to fap at least once. The (hentai) plot made sense to me