Chiba started producing and recording music at the age of 18 with while making various
mixtapes, until he met producer 318 and started releasing material under the label Gunsmith Production. He saw an early underground success within the sub-urban Japanese scene when he produced Lil Kohh's song "Young Forever". The accompanying music video went viral in Japan. In 2014, Chiba released his major 2nd studio album titled
Monochrome. The album was a fair success among the urban acts and its lead track had a big reception on YouTube. In 2015, KOHH along with Japanese artist Loota collaborated with
Keith Ape's track "It G Ma" (잊지마) which became a major hit single in Japan and South Korea apart from gaining international media attention. Back in Japan, Kohh resumed his work and continued working on his album
Dirt after releasing his delayed first album 梔子 (
Gardenia).
Dirt was released on October 28. The album was also released internationally via
iTunes in October 23. Chiba was featured along with
OG Maco on the track "Buchiagari" by Japanese DJ Ryow. In 2016, Kohh collaborated with
Frank Ocean on the single "Nikes", available on the physical album copy of
Blonde. Chiba was featured in a song by Japanese American singer
Hikaru Utada, titled "Bōkyaku", from their sixth Japanese album
Fantôme. In 2018, Chiba was featured in an exclusive bonus track "Runway", in the Japanese
iTunes version of
Mariah Carey's
Caution album. Chiba's fifth studio album
Untitled was released by
Nippon Columbia on February 2, 2019. In 2021, Chiba retired the moniker Kohh, choosing to go by his birth name Yuki Chiba. He would later state in 2024 that he would no longer be performing any songs from the era as well. Chiba took a three-year career break before returning on February 12, 2024. He uploaded an official music video called "Team Tomodachi" (チーム友達), which went viral. Team Tomodachi has had multiple remixes with other artists such as Duke Deuce, ¥ellow Bucks, Jin Dogg, Bun B, Watson, and many more. Chiba was featured on American rapper
Megan Thee Stallion's 2024 track "
Mamushi" from her album
Megan. The song went viral on social media and became Chiba's first-ever entry into the US
Billboard Hot 100 at number 68. He made his US TV debut at the 2024
MTV Video Music Awards when he performed the song alongside Megan Thee Stallion. In November 2024, American artist
Will Smith released his own remix of "Team Tomodachi", marking one of the highest-profile Western collaborations on the track. Smith announced the remix to his 70 million Instagram followers, later sharing a video teaser that amassed over 3.5 million views. ==Reception==