Okamura made her WTA Tour main-draw debut at the 2014 Japan Women's Open, where she received a wildcard entry into the doubles tournament, partnering with Kotomi Takahata.

They defeated Misaki Doi and Elina Svitolina in the first round, but lost to Darija Jurak and Megan Moulton-Levy in the quarterfinals.

[1] Partnering with You Xiaodi, she was runner-up in the doubles at the 2023 WTA 125 Copa Oster, losing to Weronika Falkowska and Katarzyna Kawa in the final which went to a deciding champions tiebreak.

[2] Okamura made the main draw at the 2024 Toray Pan Pacific Open as a lucky loser and defeated qualifier Hailey Baptiste, having lost to her in the final qualifying round.

[3] Okamura lost to ninth seed Katie Boulter in the second round.