Hiyama Kiyoteru is a Japanese VOCALOID developed and distributed by AH-Software Co. Ltd., and was released for the VOCALOID2 engine.
His appearance was illustrated by Umetani Atarou. He is designed as a young teacher. He ends up teaching mathematics to Kaai Yuki. And according to his official profile, he is part of a band called "ICE MOUNTAIN" where he plays guitar and vocals as "Ice Teru".