The Sengoku Era is when ninjas first started to emerge in Japan between the 15th century and the 17th century and this is their story. Deep in the forest there is a perfect circle of trees surrounding a single wooden house. In this house lives a family notoriously known as the Koga family, a family of highly skilled shinobi. Among these shinobi is a boy named Hero Koga who will be forged into the most deadly ninja who has ever lived italics are thoughts bold is a change of setting