古川本舗
Fullkawa Honpo (古川本舗 Furukawa Hompo), is a Japanese musician, who began releasing Vocaloid music under the name Fullkawa-P (古川P) in 2009. After self-releasing Vocaloid music and self-cover extended plays using his own voice, he debuted under independent label Balloom using the name Fullkawa Honpo in 2011.
Official site: http://fullkawa-honpo.com/