After graduating from high school, she joined Tasaki Perule FC in 1998.

In 2003 season, she was also selected MVP awards and the club won L.League championship.

On May 31, 2000, Otani debuted for Japan national team against Australia.

She scored a hat trick in Japan's victory over Argentina in the 2003 World Cup.

This biographical article related to women's association football in Japan is a stub.