There's only 1 chapter now but I can smell the trouble like I feel like it might become dark at some point but not so dark of a plot just a little bit. The ML(hero), I smell that he is a bit of a red flag because he is forcing his ideals to our FL and him saying things like he'll kill or I guess wipe out the world if the FL have a man other than him or something I immediately forgot, sorry. Anyways, it's still at chapter 1 so maybe will see more.
Sekai o Sukutta Saikyou Yuusha ni Stalker Sareru Mura Musume no Hanashi