Solopiece

A antisocial kid reads manga to cure his loneliness and boredom one day after reading the latest chapter of "All Rounder" a blue screen appeared in front of his face. [congratulations you are the first to read 50,000 chapters of collective manga] [you have been rewarded with the manga integration system] A ranking system for characters in this novel G-Rank: Newbie with a provisional license. Not an actual adventurer. F-Rank: Apprentice. Beginner adventurer. E-Rank: Average adventurer who can proclaim themselves as such. D-Rank: Mid-rank. Can be a party leader. C-Rank: Veteran. Superhuman by civilian standards. B-Rank: Top class. Usually the strongest member of a small guild. A-Rank: Hero. Select few within a given country. Bards begin singing songs about you at this rank. S-Rank: Legend. Only ten have ever existed. Kings bow before them, and they have the authority to command Guildmasters. Able to use Wai without use of enchanted weapons SS-Rank:God. only two have been known to be even close to reality nobody knows if they're real but if they are they might be gods among men.

A man gets reincarnated you know the story but God's bored of that old trope so he gives him a different thing to do to spice up anywhere he can with the magic of devil fruits. As a balancing act instead of haki being the only way you can injure a logia/paramecia user materialization will cost stamina unless there is some form of energy in that world then it will cost that so that they are not immortal also just because there is an energy system in that world doesn't mean necessarily that that character has access to that power system at least without personally learning that power systems like Nen or any other power system Everybody has it but not everybody has access to it.