Hosei Kijima was selected 17th overall in the 2024 MLS SuperDraft by St. Louis City SC and signed a first-team contract with the club on February 20, 2024.[2] Later that same day, he made his debut for St. Louis in their CONCACAF Champions Cup match against Houston Dynamo, scoring the game-winning goal after coming on as a substitute in the 86th minute.[3]
On March 16, 2024, Kijima made his MLS debut for St. Louis City SC, coming in as a substitute in the 71st minute to replace Aziel Jackson.