Kamen Rider Hibiki

Kamen Rider Hibiki (lit. "Masked Rider Echo Ogre") is a Japanese television series, serving as the fifteenth installment in the popular Kamen Rider Series of tokusatsu programs. It is a joint collaboration between Ishimori Productions and Toei. "Kamen Rider Hibiki" first aired on January 30, 2005 and aired its final episode on January 22, 2006. TV Asahi's Super Hero Time alongside with "Mahō Sentai Magiranger".
Plot.
The Kamen Riders, known as Oni, battle man-eating beasts called Makamou with "pure sound". One of the Oni, a man named Hibiki, ends up having a "teacher-and-apprentice"-like relationship with Asumu Adachi, a young boy unsure of himself and is at a crossroads in his life as he transitions to high school. Asumu learns to be an adult through watching Hibiki and the other Oni as they all train together to hone their skills in fighting the Makamou and the homunculi aiding them. However, the sudden rise of Makamou numbers proves to be a prelude to an upcoming calamity.