Tatsuya Kitani is a Japanese vocalist, bassist, guitarist, composer, arranger and programmer. He is also known as a Vocaloid song producer, going under the name こんにちは谷田さん. Tatsuya started publishing music on the Internet around 2014. Later in 2017, he would start performing solo activities, while providing music as a lyricist. In 2018, he would form the band sajou no hana with members Sana and Sho Watanabe.