KIYO＊SEN, a Japanese fusion jazz duo, was formed in 2013 through the collaboration between Kiyomi Otaka, the keyboard player of Casiopea -P4, and drummer Senri Kawaguchi. The duo often performed with guest artists on guitar and bass. Their debut album, Chocolate Booster, was released on January 18, 2014, under VEGA Music Entertainment, followed by DUOLOGY (2015), Trick or Treat (2016), and Organizer (2018). Their fifth album, Drumatica, was released on November 6, 2019. The band has also released live DVDs and the single "Exatune" in 2022, touring extensively in Japan.
