Naruto: Building Insect Kingdom

The setting: The mid-Second Great Shinobi War. For eighteen years, I played the part of a ghost within the Hidden Leaf—a "gray man" whose existence was barely a footnote. My plan was simple: live quietly, fade away. But a single moment of soft-heartedness shattered a decade of camouflage. To save a teammate, I accidentally ended the life of an elite Jonin. The secret was out. Like a shark scenting blood, Danzo came knocking. My clan elders sat me down for a "talk" that felt more like a sentence, and the Third Hokage looked the other way, his silence a tacit blessing to my forced recruitment. So, I did the only logical thing. I defected. On my way out, I sent my partner of five years to his final rest, then wiped out a pair of Root assassins for good measure. Due to the "heinous" nature of my departure, I was branded an A-Rank Rogue. — Description from novelcodex.org