Nige Jouzu no Wakagimi

Kamakura Shogunate is a Japanese empire that selected an 8-year-old boy, Tokiyuki Houjou as their next successor. He was just a kid with no special skills besides his hide-and-seek. Suddenly his whole world changed when enemies from other empires attacked on the Kamakura and he lost all of his loved ones in that. He luckily escaped from that with the help of a priest and now those people are after him. He had to learn a lot of things so now he just wanted to take revenge on this love one and wanted to get back his Kamakura. He found his commander who promised him to train and also help him in getting it back with him. He is the forbidden hero of Japan.