Okay, I understand that the setting has magic and stuff so some conventional knowledge of war cannot be expected in the story. But how comes the cavalry got surprised by a wall of spear. Edit: And they just charged right into it impaling themselves
Since no one knows the source of the zombie, can't he just pin the source to be magical and then play the part of awakening a new power. He can start with physical enchantments like the super strength and super speed cause it's easier to mask it as accidental discovery then slowly "awaken" other...
Common misconception in fantasy in fantasy or sword related genre. A sword is not heavy. Judging by the size, that sword is probably only 2 kg and most of the weight is not on the blade but on the guard, handle and pommel. So it shouldn't be hard to lift and swing it, even for a child
He wants to go back to HIS Japan, the one with no magic (basically our world), not the the other world where he got betrayed
Would still be ded tho since he got Isekaied in a landslide
Considering the old capital got destroyed by monsters it wouldn't be a surprise if other cities, towns, villages got destroyed as well and resulting in small settlements of humans to rebuild everything from zero