Koutei to Kaibutsu

"I am the first emperor, Utosa" In the basement of the palace, a mausoleum was protected by heavy metal doors. A monster was said to sleep there. Tao, a mere puppet to his ministers, had never once tasted power. Even his only friend was executed by the ministers under him. Desperate, he enters the forbidden depths, encountering a man with white hair...? (Source: Libre, translated)