It's scary how right you are and you don't even know how much. (Spoiler alert)
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He only becomes a Demon lord after his 7th playthrough though and during his 8th he can switch between the demon lord and hero classes
Wait...
He actually becomes the demon lord!! hahahaha and he has to go through this 7 to 8 times.
his 4th playthough is the last one in this version of fantasia, the 5th playthrough is an alumnis' festival, the 6th-7th are in fantasia but he starts in the northern continent and lanuvel is his sister + there's extra content and the demon lord is a lot stronger, then he goes to earth, but *omitted* and he comes back for an 8th playthough again with a different scenario, there's no lanuvel and the hero of that world is Sieg.
wow... he has to go through a lot
I hope through all this he is still super OP, angry, and willing to kill whoever gets in his way.
he gets more op, but his enemies become more op as well... kinda...
They should never had made him go back a third time, they are making a new demon king here
I really like this webtoon, it’s awesome