​​C.O.S.A is a rapper and producer born in Chiryu, Aichi Prefecture, Japan. At the young age of 12, he pursued his love for music by writing lyrics and later became interested in rapping. C.O.S.A. released his first album "Chiryu-yonkers" in 2015, two years after a period of inactivity in music production and lyric writing. In 2016, C.O.S.A co-wrote the album "Somewhere" with KID FRESINO and, later in 2017, released his EP "Girl Queen". In 2019, C.O.S.A. released his single "Death Real", surprising fans with its unexpected release.