Kenshi Yonezu (米津 玄師, Yonezu Kenshi) is a Japanese musician, singer-songwriter, record producer and illustrator who began releasing Vocaloid music under the stage name Hachi (ハチ) in 2009. In 2012, he debuted under his real name, releasing music with his own voice. He has sold at least 4.2 million physical copies and more than 7 million digital copies in Japan.

Source: Wikipedia (https://en.wikipedia.org/wiki/Kenshi_Yonezu)