Naruto: Fast Level-up System

Ren Aoi gets a super-powered system that lets him quickly level up his skills. Now, he’s strong enough to take on anyone in the Naruto world! The First Hokage likes him, but the Second Hokage hates him. He’s friends with a young Tsunade, and he’s out for revenge against Danzo. Ren is determined to become the strongest ninja ever! — Description from novelcodex.orgFull novel: Naruto: Fast Level-up System — read the rest free on N​o⁠v​e⁠l​C⁠o​d⁠e​x⁠.​o⁠r​g⁠