I'm not sure how this isn't cut down by axe-kun yet. Low-blood-sugar fueled rant incoming!
-MC can't kill 2 obvious murderers to save thousands of innocent people.
-MC isn't strong enough, so he goes and gets a McGuffin, and now he's strong, except he won't use his full power.
-MC forgives the girls who betrayed him because, umm, ladyparts? Not really sure, because MC is neutered and shows zero romantic interest in any of the FMCs.
-Then the girl dies anyway because he is too big of a coward to just curbstomp the bad guy with his full power from the start.
I just came back from the future to complain about the next 10 chapters. This fight is JUST wrapping up @ ch. 63! It was already a really boring arc. Two sides of a town hate each other because of religious reasons... We get it, Isreal. Poorly written religious politics in a shonen kids manga, that's a surefire way to keep young readers interested!
I want to like this one, mostly because Haku is great. But OP MCs that refuse to kill (justified/self-defense killing, not mass murder-boner nutjob MCs, that's a different genre!) or refuse to use their full power because "reasons" is a plague that ruins a lot of this whole genre. Damn. Ok I'm done griping. OOOOH I just found ice cream cones in my freezer!