
I found a Spanish version in FB and use a translator.
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it is said, if the demon lord and human really love each other, their soul are tied together. and if the human reincarnated, they can meet (like being pulled together).
But, because demons cannot die, it's literally a curse to the demons to wait for their love ones to reincarnated without knowing when.
And the Hero is not from this world, and the reincarnation cycles rule is 'they have to reincarnated in their own world'.
And since the hero knows about this, the hero said to the demon lord 'find me, because in my world I'm just a human with no magic, I cannot home here (the demon lord's world)'.
That's why after he heard yamato call him, he goes to the human world of the hero to find him.
Yeah, according to the raws, he's gonna dieeee!
Or idunno I didn't understand a single thing since it's in spanish. I was just guessing, did he return to the human world and forgot about being ever sent to another realm and became a husband to Rei, or did he die and got reincarnated and Rei showed up hoping Yamato will remember him!
Please whoever speak spanish here, spill the tea! I am dyiiiing here