Hamaguchi was heavily inspired to make games after playing Final Fantasy VI, wanting to make a game of its quality.

In 2003, he graduated from HAL Nagoya College of Technology & Design and in the same year entered the games industry.

In March 2018, Hamaguchi stepped down from his role of Mobius Final Fantasy Project Leader in order to focus on Final Fantasy VII Remake.

[2] In April 2019, during the restructuring of the company's business divisions, Hamaguchi was promoted as co-director on Final Fantasy VII Remake alongside Nomura, making it his first directorial debut.

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