Rokuro is a silent and composed man, but he often remonstrates Yukimura for his unheard-of behavior. Rokuro's clan has served the Yukimura Family for generations, and Yukimura places tremendous trust in him.
Rokuro joins Yukimura in his room when he meets with Isanami, who asks for help. However, Yukimura refuses and asks Rokuro to set up a room for her to stay and closes the door for Yukimura after he makes his way out. Later, he is seen talking to Yukimura about Isanami's power and the ninjas that chased her. Yukimura also states that he's planning to gather 10 strong warriors that can be defeated by none. Rokuro then senses Saizō Kirigakure above them and quickly gets rid of him with him attack. At the festival, he joins Yukimura and protects him when the castle was attacked by using his ultrasonic attack. He later absorbs the words from Ishida Mitsunari's (Tokugawa Ieyasu’s rival) letter and Yukimura burns the letter. When Kamanosuke Yuri joins Yukimura Sanada's ten warriors, he attacks Rokuro and says he'll kill him if he interferes. Rokuro seems upset that Yuri will be living with them from now on and reads Saizō's mind for the writings which were written on the wall of at the bottom of the Izumo shrine with his right eye. Yukimura and Rokuro seem shocked at whatever is written on the wall and Yukimura tells him to show no one his right eye.