Hiyama Kiyoteru (氷山キヨテル) is a Japanese VOCALOID developed and distributed by AH-Software Co. Ltd., and was released in December 2009. His voice is provided by Japanese male singer Kiyoshi Hiyama (比山貴咏史, Hiyama Kiyoshi).
Kiyoteru is a teacher. He participates in a rock band called Ice Mountain on weekends, with the stage name "Ice Mountain Teru". According to the book Ice Mountain, the default configuration for his software package happens to be Kiyoteru's vocals as a rookie singer. He is also said to be good at mathematics.
He was, overall, the least popular of the AH-Software trio of Vocaloids. All three took a while to gain popularity, leaving him the least popular Japanese Vocaloid in Japan for some time.
An independent search on Nico Nico Douga revealed that most VOCALOIDs had less then 1,000 videos uploaded on Nico Nico Douga in 2011 between July 1st and December 15th; Kiyoteru fell into this category.
Yuki and Kiyoteru were announced in November 2009. Interestingly enough, at the end of the previous month Crypton Future Media had just made their own announcement of a series called Project if… which was set in a elementary school setting.