even if they trained him since he was 2 years old just how flimsy would the demon lords defences have to be ?
and the 3 holy swords don't count because any enemy worth his salt adjusts his defences to suit the attacker
also his treatment afterwards stealing credit and setting up a proper imprisonment for a hero needs a ton of prep so thats something that can be borne out of a sudden event : "oh crap he got cursed" so his backstory : i got betrayed because the demon lord cursed me is worth crap
@Laughing_Snake is not that what human always do? in order for human to grow, we need obstacle and challenge. antagonizing someone or some other group is one of the option
but yeah i understand what you mean, history written by the victor after all
4 beautiful busty ladies that can't even seduce 1 single innocent boy... give the boy a few more years and I'm sure the genre will be hentai. why the fuck dense MC is so popular in Japanese works? they find that kind of people interesting?