​​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.

C.O.S.A. stated himself, during an interview with Takeshi Kuno about his music and motivation, that he didn't treat "words as notes", allowing him to freely express his thoughts on a deeper and more serious level; while this is the case most of the time, he thinks that his music "cannot serve as background music". C.O.S.A. continues to provide music that lays out his strong thoughts and views about the state of the world and his experiences. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.