Traveling through time and becoming Danzo Shimura, the hotpot king of Konoha, he can only become stronger by being beaten.
The bound king system is actually all passive skills!
Killing the enemy will permanently injure you, and you will automatically recover your blood when out of combat. You can also attack more when you are injured.
From then on, there was a madman in the ninja world who begged others to beat him.
"Please, hit me hard, don't be polite."
My name is Danzo, and I'm in a panic right now... Because no one can hurt me anymore, and I can't continue to get stronger.