In 2007, she began attending Tomakomai Higashi High School, which boasts one of the country's top co-ed ice hockey clubs.

In July 2019, she suffered a torn hamstring at a pre-season national team camp, which sidelined her for two-thirds of the 2019–20 season.

Osawa made her senior national team debut in November 2008 at the qualification for the women's ice hockey tournament at the 2010 Winter Olympics, though Japan narrowly missed qualifying.

[6] At the Olympic women's ice hockey tournament in 2014, Osawa tied Hanae Kubo to top the team's scoring ranks with 1 goal and 2 assists for 3 points in five games.

[2] A graduate of Tomakomai Komazawa University, Osawa has worked for Dynax Corporation, a Tomakomai-based automotive parts manufacturer, since 2014.