Manga recommendation request

[Jackone]

I really like fucked make MC wether they are strict and have gone through grief or are smart talking as a way to combat their trauma, manipulative, crazy, edgy or sometimes if they are written as people who just kill for fun or kinda like it( light yagami who’s manipulative and kind of kills a bit for pleasure, and Mc from drifters who enjoys killing). So yeah I like one of those characters in a romance cause I never really see that and even when I do see that like in berserk it’s there but it isn’t as big as the other themes in the manga and takes a side step in the manga. Yeah a romance with that type of Mc and female lead could be sane, crazy, and like help the mic through his grief or just accept mc for who is I don’t really care I just want a good romance. Sex scenes that are built up would be nice I can go for any genre except mech. Ik im asking for a niche and plz be seinen or shounen thx. Edit: plz make the Mc confident above all else cause I kind deal with people in manga who get a nosebleed every time they see a girl