 It seems that he has a very secret agenda and would even sacrifice his sons to achieve his goals.Tendou later confronted Riku; the confrontation ended with Riku telling him that Tendou's sister (actually refers to Hiyori, not Jyuka) was not in good hands, which naturally made Tendou lose his composure, and Riku walked off, joking about Tendou's "walking down the path to heaven to rule over all".During the end of episode 36, he displays that he indeed knows about the Hopper Riders, saying they have opened the Gates of Hell.