The story reads choppily, IDK how to explain it. I thought the author was experienced.
So he has been 8 years inside a cabin, twiddling his thumbs, and then uses his "previous-life" training to dodge an axe? bruh xDDD
No judgement but why didn’t you go with some version of a wood-wood fruit and use hashirama and the hero Kamui Wood from boku-no-hero as ideas for how he would fight?
You already wrote the best one piece fanfic out there. Whilst it was super good, I'd rather see you go into new franchises than repeat one.
Anyways, looking forward to more.
Kinda weird. Because we all know that hashirama is tsunade's grand father why bother changing their relation. Would been better is just make him become nawaki or something