Basically, this story.
Side characters and villains: 'You are a discriminated character, so there is no way you are OP even though you use OP magic all the time.'
MC: 'Why are these side characters not as OP as me.'
Love interests: 'Omg, he's so cool, he saved me, I fell for him and I don't...
Haa... I wish it was Tatsuya... But unfortunately, this guy is [Spoiler] dense and completely lacks common sense even though he is supposed to be a top-tier assassin. He aces in everything but he doesn't understand why others are lacking.
Well, she finally joined the shadow garden. Well, the thing that I like most about Rose is that [Spoiler] She won't even mind going against Shadow if it's for Cid. Lol. The only member of shadow garden that loves Cid not knowing that Cid is shadow.
Well, I feel bad for the girls in the prequel story for this. They never got him to love them but now, their successors get the chance instead of them.
Hmm... It looks like this is a spin-off to the " https://mangadex.org/title/52893/forced-to-become-the-villainous-son-in-law ". It looks like this is the part of the main story that covers the arc with the third heroine which comes in the future of the main story. So, a sequel spin-off? Someone...