It was good till the moment mc created for himself a jet plane and f**king ak47 assault riffle, in the world of sword bow and magic... the latest chapters are absolute trash, mc lost his brain and acts as average shity anime super hero.
First 5 chapters 9/10, latest chapters 2/10.
Many mangas have the same plot about the loser and Mary Sue fiance, can't remember a single one that had a satisfying ending, most were axed, some canceled.
And yes, a harem tag means that no one wins.
Wow, what a original plot, a guy slept with a girl who turns out to be his new stepsister, so original. And you know what can be even more original? - If she has a sister or two, so mc could sleep with them too!
Nope, she is the reason mc and fmc around each other, she let them meet and hand out. So yes she is the wingwoman, and she's the one who dictates the pace of their romance, she constantly makes opportunities for them, gives them time and space.
Well, it was a wrong decision to bring this back story, manga could have been better without it, all that happened fmc could explain at some point with a few words in a single chapter without all this pointless tragedy.