Tatsuya Kitani is a Japanese musician, singer, lyricist, composer, and arranger. He is the bassist of the three-member band sajou no hana. He was also active as a Vocaloid producer under the name of "Konnichiwa Tanita-san". The affiliated office is Smile Company, and the affiliated label is Mastersix Foundation in Sony Music Records. His official fan club is "Club Unreality". From Wikipedia
