Yoshimura was born in the Osaka suburb of Kawachinagano. He studied law at Kyushu University, graduating in 1998. He passed the Japanese bar examination later that year and was admitted to practice as an attorney in 2000, at the age of 25.
After working for several years under Tokyo-based attorney Shintaro Kumagai (熊谷 信太郎), Yoshimura returned to Osaka and co-founded the Star Law Office in 2005. He remains a partner in the firm as of 2017.
Yoshimura was elected to the Osaka city council in 2011 as a member of the Osaka Restoration Association headed by Osaka Prefecture governor Toru Hashimoto.

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