@Hollow7F , Mirroring what @stride said, according to WN the MC has absolutely no memories of his past self like their name, personality, family, or how they died.
He has a vague understanding of stuff like "the language people speak isn't Japanese or English" and other things like "everything looks medieval-ish" but his memories are very limited/blurry.
As for the MC's original gender its technically up on the air, but he does use 俺 (ore) to refer to himself so I'd place my bets on being male; although he could be one of those "Orekko" heroines i guess.
He doesn't remember his past, but his soul innately does. He helped a young girl, whose struggling with Mana Control, finally have it... all the while make her sound like having sex.