Synopsis

Did [Data Redacted] know that isekai was a real thing? Yes. Was he right about a lot of the mechanics? Again the answer is yes... by 85 percent. But sometimes, it's that 15 percent that you got wrong that really hits ya. I wonder what the locals will say!
Greycore follows the death, afterlife, and reincarnation of someone that's not entirely wrong, but not entirely right.