So there are 3 reincarnated individuals in this story. The main love intrest, Pamela. The heroine of the game, Nicole. And of course the MC, Isaac. Pamelas reaction to meeting Isaac was the same as his (aka she is also in love with him). But she still takes her role as the crown princess fiancee seriously so she doesnt break up with him for the MC. That said even if the MC didnt interfere with anything the crown prince would have still broke up with her because the heroine is aparently extremely atractive in their world because of the difrence in aesthetics and she manages to seduce all the capture targets. The only thing the MC really does is encourage the prince to go for the heroine in order to get Pamela. Most of the fiancees of the capture target fall in love with the MC because he cleans up the mess the capture targets make after they get seduced by Nicole. That said he actually doesnt want a harem even now that he managed to become king because he doesnt want to create problems for his familie. That is to say he manages to become king after orcestrating the the greatest assassination known to man and blaming it all on the crown prince. Im leaving out the context as to how he did it because its a long story. Also he marries Pamela and Lisa. He marries Lisa because she couldnt find anyone for herself and he wanted to stay with her. Honestly the MC isnt an evil person, but when it comes to his goals he can be as really coldblooded.

The MC and the main heroine of the otome (Nicole) are reincarnated. We don't know her identity in previous life at the moment, except that she is japanese. None noticed that the other is reincarnated, but the MC suspected it lightly before rejecting the thought. I personally had a theory that the villainess, Pamela, was reincarnated too (strange things pointing that she may be japanese), but nothing strong and some other spoilers seem to deny that theory. We never learned the reason for reincarnation.

That one is spicy. The MC only loves 2 girls, and got married, but he might get married to a third one later. The harem is hitting hard, many girls are interested in him. As far as I remember, he got confessed by 5 girls outside the married ones but rejected all of them.

Pamela, the villainess becomes the first wife, and Lisa, the foster sister and his nanny's daughter, becomes the second wife.

He plans it, and it seems it's gonna work, but not exactly how he planned it nor how I imagined it. Less bloody.

Not really explained yet, but I think it'll be completely explained soon. Basically, the "soul" of the girl made him attracted to the point of fascination. She got the same feeling from his "soul". It may be that she is a reincarnated too and that reincarnateds are fated for each other, but it is said that it is not a normal 'love' feeling. Male Capture targets of the game also feel that strong attraction power towards the main heroine from the Otome, in an unatural way. Something or someone's at work.

and he actually did it, vol16 is the war arc of isaac vs jason, and the current vol17 is the aftermath of the war that tells the process of how isaac become the king.

Pamela is actually his sister from the previous life, in which isaac had some serious self-crisis knowing he did what to his sister.... thus he ran away to his job and to woman, to bring himself further away from his sister... kinda sad since I ship both of them strongly.

very severe spoiler

I added a in*est but not really tag for y’all, thank me later.