Nige Jouzu no Wakagimi

It is the story of an 8-year-old boy, Tokiyuki Houjou who is the next successor of the Kamakura Shogunate. He is just a kid and has no special talent for anything. His life turned suddenly when the empire of Kamakura came under the attack of enemies. He ran to save his life and a commander helped in it. Now the people wanted to kill him and he had to gain that power to defeat all his enemies and get back his Kamakura. He is a Japanese forbidden hero who emerges from the ashes.