Basilisk

Basilisk is one of the cruelest anime around. Its centered around a sad love story.It was Keicho Era 19 (A.D. 1614), 73-year-old Ieyasu was wondering which of the brothers he should choose as a successor, Takechiyo or Kunichiyo. Takechiyo was the elder but he was stupid, while his younger brother Kunichiyo was clever. In order to choose the successor, Ieyasu decided to make Koga and Iga fight against each other. Both clans would choose ten best ninja to fight. If Kouga ninja survive, Kunichiyo would succeed to Shogun. On the hand, Takechiyo would become the next Shogun if Iga ninja win. Because Hattori Hanzo the first made them achieve a truce, they hadn't had an apparent fight for years. Therefore, when the truce was broken, they went for fights as if they were unleashed hound dogs. The only weapon they use were their own bodies. They had special abilities that men could hardly imagine.