Kato Ken was not of direct descent to the Sato family, but having been mature, steady, and diligent since childhood, he was deeply favored by the elder head of the Sato family.
Beginning at the age of twelve, he followed the Ying Country transcendental master Nakayama Kono to study ninjutsu in order to temper his physical constitution, and had even been taught secret arts.
The technique he was currently employing was precisely the mental secret art he had learned from his teacher, Nakayama Kono.
Chapter 416