Otaki was born in
Hiratsuka on July 28, 1989. After graduating from
Waseda University, she joined French
Division 1 club
Olympique Lyonnais in 2012. The club won
2011–12 UEFA Champions League. In June 2013, she returned to Japan and joined
Urawa Reds. In December 2014, she moved to the French club
En Avant Guingamp. In May 2015, she retired end of 2014–15 season. In 2016, Otaki took a year away from football to participate in the 17th edition of the
FIFA Master. She graduated in July 2017 and later that month signed a one-year contract with
Paris FC. In January 2018, she returned to Japan and joined
NHK Spring Yokohama FC Seagulls. In 2019, she moved to
JEF United Chiba. ==National team career==