I'm looking for series that are similar to Mushi-Uta (Novel) and Rakuin no Monshou (Novel) in which...

1. The main Heroine likes/loves one identity of the Protagonist and is friendly with another identity of the same person.
2. The heroine doesn't know that the two are the same person until the later parts or end of the story. 😉
3. The story has good combat scenes. 😎
4. No harems unless they're important for the plot. >:-(

Both novels and mangas are fine.

"You are weak, from the moment you could only use your life as an excuse for committing crimes, you insulted that very life. You didn't notice, you were afraid of noticing, and you went around destroying everything that could make you notice, but you have also crushed your ability to ever gather respect." -Shokuhou Misaki

Wow, surprisingly difficult request... let's see:
Death March kara Hajimaru Isekai Kyusoukyoku (Novel) There is something like that starting about half way through, but there is a harem element that might not be considered "plot relevant"... though it's not harem in the way that he's in a relationship with all of them, rather in the way that he seems to have "collected" a lot of female companions/people to take care of.

Doupo Cangqiong (Novel) There was a girl like that, but she wasn't the heroine and he doesn't like her (that way by that time) in return. Has a manga/manhwa that's pretty up to date with the chapters too.

Sailor Moon If I remember correctly about the Mask guy... sadly...

Magdala de Nemure Turns out neither of them are who they think each other are technically.

Hidan no Aria She originally "falls for him"/"becomes interested in him" because of his "alter ego"/"BA mode" self.

Aaaand... that's all I can think of. Hope one of them fits.

Bacchanals, to arms!
Quote of the Year (2017): "The mind is its own place, and in itself can make a heav'n of hell, a hell of heav'n." -John Milton

dn angel
basara
1/2 Prince