Ima be honest here and say this. I may seem like I'm putting a review in here really early, afterall, I'm only 2 chapters in, but, there is just one thing I had to put in here that the author keeps doing. Please...PLEASE stop repeating your words so much. This is just advice from a fellow writer(although I don't really publish) and put some more personality into your characters. From what I can see, they're just generic with a basic face.
What I mean by that is, for example, Yukan, the MC, is a bit flat and for the beginning of your story, that ain't a good sign. He has the all round, cliché sad backstory and even though he has a system, I feel that he's not really utilizing and exploring much of it...first of all, how did he get the template?(Probably explained later, right?)
Second, another useful tip I learned, stop extending your paragraphs and sentences. There are way to many unnecessary words put into it, and rather than interesting, it makes it tedious to read. If you put into your sentence "Konoha was at peace once the battle was over" you don't need to continue adding afterwards 'The children were running around in happiness after the war ended.' It's repetitive and both still give off the same message, just in different words.