friend of Hitoshi, who has been friends since childhood and joined Takeshi to aid him once he became the current Hibiki. The head of Takeshi's weapon design section and Midori's mentor, a former Oni who is said to have defeated twenty Makamou single-handedly. He is also a singer in his spare time. Much of Takeshi, including Ichiro, fears him because of his strict disciplinary personality (with the exception of a few people). When he is angered, he chases his "victim" and hits them with a paddle. He also travels using a motorcycle with the newly improved Armed Saber which he made and was almost too powerful for any Oni to control, causing them to lose their transformation abilities for a month. When Torodoki and Hibiki were affected by the Armed Saber, Konosuke trained the two with his special training to improve their powers. The training, utilizing energy from the gut while singing, paid off for Hibiki because it enabled him to wield the Armed Saber. After that, Konosuke left for Yoshino. Others A high school student who Hibiki took under his wing for advice and decides to become his apprentice before resolving to live a normal life and support Hibiki instead. Asumu's classmate and Todoroki's cousin. A high school student who becomes Asumu's rival after becoming an apprentice to Hibiki. After Asumu stepped down from becoming an Oni, Kyosuke became both Hibiki's only apprentice and a full-fledged Oni a year after the events of Orochi. Asumu's mother who works as a taxi driver. Real name , Shuki is a former Oni with a knowledge of Oni lore who uses ancient Oni techniques that include the Firebird shikigami and means to appear in her early 30s. Unlike the other Oni who fight the Makamou to protect humans, Shuki's motivation was to track down and kill the Makamou Notsugo after it slaughtered her family years ago. Because of her personal vendetta, and inflicting her former apprentice Zanki with a crippling injury when her chance to kill Notsugo presented itself, Shuki was stripped of her Oni title as she was being gradually consumed by her Oni power. Shuki resurfaced years later in a suit of before stealing Todoroki's Onjo to resume her form as , taking Akira as her apprentice due to their similarities. Shuki succeeds in exacting her revenge on Natsugo by sacrificing herself so Zanki can kill it, and Shuki requesting