Y/n's Bio

Hello there.

Y/n Tsugikuni, after waiting for his brother in the realm of the dead, finally gets reincarnated, at least he thinks so.

He wakes up in a city with a book that explains everything.
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2 twins prepared to fight a god and failed.

They were teleported to this world, who knows what will happen.
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This story is in progress, don't expect anything.