Haru Yokouchi is the sensei of the Sinundi dojo as well as the rival of Amano since they were mere students before they eventually became sensei of their respective dojos. Yokouchi is known for his stern nature, keeping a close eye on his students to ensure that they become stronger and perfect the arts taught within his dojo, not out of obsession with power or control, but to see that his students could survive in the world around them, although many in the Shakugan Dojo thinks otherwise.