2019–2020: Produce 101 Japan and debut with JO1 In September 2019, Kawanishi convinced his family to allow him to audition for
Produce 101 Japan despite having no experience in dancing or singing. Upon training in Korea, Kawanishi made his debut as a member of
JO1 on March 4, 2020, with the release of their first single
Protostar under
Lapone Entertainment.
2021–present: Acting debut Kawanishi made his acting debut on February 26, 2021, playing an unnamed role in the
Yoshimoto Kogyo-produced anthology film
Meters Away, Worlds Apart segment "Today is A Good Day", alongside his group-mates Ren Kawashiri and Syoya Kimata. On March 3, 2023, Kawanishi was cast as Sōma Shiki in the live version of the web manga series
Play It Cool, Guys, with
Yuta Nakamoto,
Dori Sakurada, and Maito Fujioka. Kawanishi wrote JO1's digital single "Happy Unbirthday" for the group's
Alice in Wonderland-inspired exhibition, JO1 in Wonderland!. The song was released on March 26, 2024. The digital single also includes the self-written song "Heaven", which Kawanishi described as "a demo song Kiyosumi might have made". In October 2025, Kawanishi was cast in
Wowow's original drama series on domestic violence victims
Shadow Work. Kawanishi played Yūma Araki, a junior detective and partner to the co-lead character. On December 5, JO1 released "Santa-san E" (), a song co-written by Kawanishi and was originally performed a year prior to celebrate the group's fifth anniversary. ==Discography==