Two-Dimensional Invincible System

My name is Chen, because I saved a little loli and traveled back to the Warring States period of Naruto. I have a friend named Madara and a younger brother named Izuna. In order to improve their strength, I used countless methods to make them both stronger. Just for the sake of ordinary life, I went to the battlefield, I killed the enemy, and made Madara and Izuna strong, just for my Crystal Palace! ! ! Naruto-Devil High School-TBD This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.