Sign-In at the Heavenly Prison: Susanoo as a Starting Reward

Han Dashu transmigrated. He wasn't a prince or a general, just a lowly jailer in the imperial prison earning ten taels a month. He worked himself to death on his very first day, but luckily, he had a System.

The Naruto Sign-In System gave him Susanoo: Uchiha Itachi as his starting reward. An orange-red skeletal giant with the power to destroy heaven and earth, it could only be used for three seconds. Three seconds was enough.

From then on, a quiet young man became part of the prison staff. The inmates had no idea that this jailer who delivered meals and patrolled every day had a secret inside him capable of destroying everything. He didn't want to be some great hero or fight to be the best under heaven. All he wanted was a secure job and a quiet life.

But the prison was never peaceful. Some inmates cried that they were innocent, some cursed, some waited to die, and some tried to escape. Han Dashu listened and watched every day. Sometimes he lent a hand; sometimes he couldn't be bothered. The days passed, and his sign-in rewards kept growing while his strength grew greater and greater. But nobody knew.

And he didn't want them to know.

[Naruto Sign-In System + Prison Sign-Ins + Keeping a Low Profile While Growing Stronger + Slow-Paced Daily Life] He starts with Susanoo and three wooden decoys to save his life. This isn't an invincible powerhouse crushing everyone. It's about how a man with an unbeatable trump card quietly gets on with life in prison.