The Port Mafia Executive, Uchiwa-kun

Uchiha Yang Yan was a secret kept from the world. No one knew of his birth, But his death shook the world. Watching his father willingly descend forever into the underworld to suppress the world, Uchiha Yang Yan smiled with mocking madness. Then he turned and sent everyone who had taken his father's things straight to hell. The death of one's father demands vengeance! So, All of you can go to the underworld and apologize to him :) Madara: No need. I want a moment of peace and quiet. Fortunately, no one else can enter this place. Uchiha Yang Yan thought his father was the most extraordinary person in the world. After all, there was only one person willing to become the [Mother of Earth] for peace and for the sake of so-called friends, enduring the corruption of the underworld's foul energy day after day. Until one day, he met the leader known as Dazai, who had become the vessel of the [Book]. [What, he became like this for the sake of his friends and the world too?] [Good. You've got my attention, mister!] Looking at the other man's hollow smile, like a mask, Yang Yan felt his heart stir... So, any chance you'd change your surname to Uchiha? 1. In this version, Uchiha Yang Yan is the child of Madara and Hashirama. He came about during an experiment to fuse yin and yang powers. 2. Kaguya and Black Zetsu are somewhat redeemed, since they're actually on the same side as Madara. 3. Madara and Hashirama are purely friends, even though they have Yang Yan. 4. Yang Yan is utterly devoted to his father. Madara is everything to him, so after Madara's tragic fate, Yang Yan has gone mad. 5. The pairing is Dazai, and it is set in stone. Theme: Even the most desperate and unhinged person has a sanctuary in their heart that no one can touch