Our protagonist lived in a world of fantasy, a world of dreams and that every otaku wanted to be, but of course, if he is in such a dangerous world, it is clear that he would die more easily.
So even though he was an adventurer of the highest level, he ended up dying.
But it was not an honest death, how can we say, he ended up being betrayed?
So this goddess who was watching everything ended up giving him another chance, he will go to another fantasy world, but now with a system of levels.
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