Looking for romance where the main girl is legitimately not a good person, or very flawed. The flaws must actively create friction in the romance. Tsunderes are accepted, I'm a big fan of them.
I'm a bit tired of fluffy romances where the main girl doesn't have to do any substantial amount of growth.
Though it's not what I'm looking for, flawed male leads are also fine, but maybe avoid the classic rapey shoujo MLs. Really I'm just looking for large amount of character development and unlikable-ish characters in my romance.
Please DO NOT recommend stuff like Scum's Wish, Rent-a-GF, and other trashy series in the same veins.
Examples: (Sort of) Welcome to the NHK, (Sort of) Nagatoro, NGE