Samurai of Hachiman 1981

A mysterious swordsman called Hatokuro Yawata (Ken Matsudaira) who appeared from somewhere with white pigeons is actually Naotada Ii, the lord of Hikone Han. He was told that he had an older brother of twin by his mother on her deathbed. Hatokuro pretended to be a citizen in Edo and searched for his brother. However, in Edo, Murasaki Gumi, led by the mysterious Murasaki had power and used it as they like. One day, Hatokuro saved Okyu whose office-worker father was killed from Sanjuro Akaseki of Murasakigumi. It brought about a fierce fight between Murasaki and Hatokuro. What is the identity of Murasaki!?