Prolouge: The Human Mind

What happen if Satoru Mikami was born earlier? What happen if he's a proper gentleman? What happen if he survive the knife attack? What happen if he died much more later?

What happen if...

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Warning: Massive manga or LN spoiler.
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(the cover is from a game called counter side, this is a fan fiction of tensei shittara slime datta ken, the characters and most of the story are from the creator of tensei shittara slime datta ken.)