The worst part about this we might already know the ending. In the end there will be a big boss fight they will win with the POWA. Later on In the final chapter or maybe prior he will lose a fight against FMC. He will uphold his end and will try to leave and in the final fragments all harem members or only FMC will follow him. It's so cliche that it hurts.
Good guy acting as a bad guy. AND THE MOST overused part, MC is perverted and is scorned by harem members, like literally every manga 10-20 years ago had this dynamic (rom-com harems i mean). Now we have wimpy MC's who are not even perverted but still are being looked as predators (Author simply took early harem recipe and mixed it with modern one).