Project Kids and later became one of the main vocalists of the Japanese idol girl group Cute which she joined in 2005 and engaged in until 2017.

Project Kids to make time for school,[7] but the idea was later scrapped, and the remaining girls who were not chosen were re-branded under the name Cute on June 11, 2005.

[8] In September 2007, Okai was added to a new unit called Athena & Robikerottsu with Risa Niigaki, Aika Mitsui, and Saki Nakajima.

[citation needed] In 2009, Okai joined a newly formed unit called Tanpopo#, a revival of former Hello!

[12] A CD containing Okai's cover of Miki Fujimoto's "Romantic Ukare Mode", with "Love Namidairo" as the coupling track, was sold exclusively at the venue of her second solo live, but was also released digitally as part of Hello!