The superintendent of Taishuu High School. He always wear a face mask to cover his face for some reason. He has a hobby of finding cursed mask.   Fear calls him a weirdo for wearing a mask when she first met him. He explained to Fear that he was born with a breathing disorder, which imprisoned him to wear a mask, and if he takes off the mask, he will be hospitalized.   On the other hand, he told others different reasons; he told Haruaki that he had a scar on his face, which he does not want others to see it, while he told Konoha that he wears it due to religious reasons.

From the light novel series written by Minase Hazuki, comes a story of love, action, and comedy. Yachi Haruaki is a high school boy who is naturally resistant to curses. After his father sends him a mysterious black cube, Haruaki awakes to find a nude girl named Fear standing in his kitchen. She’s the human form of the cursed black cube – and an instrument of torture! Utilizing her special abilities, Fear fights alongside Haruaki to defeat other cursed instruments and their owners. 
(Source: FUNimation)

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Unaired episode included with the fifth volume of the C³ Blu-ray. 
 
It’s all fun and games when Fear, Yachi, and the rest of their class head into the wilderness for a camping trip. That is, until Yachi is captured by a cursed beast and Fear is forced to face her arachnophobia head on! 
(Source: Crunchyroll)

Yachi Haruaki is a high school boy. He is naturally resistant to curse and his father Honatsu sends him cursed instruments called "Worse" to let him break the curse. One day, Haruaki receives a black cube from Honatsu. At the night, he encounters a naked silver haired girl stealing rice crackers. She is the human-form of the black cube, an instrument of torture called "Fear in Cube". Haruaki and the girl 'Fear' fight together against other 'Worse' instruments and their owners using Fear's 32 mechanisms of torture.

Gabriel Sekaibashi