[citation needed] On March 5, 2018, it was announced Oku's belonging to the talent company Flave Entertainment.
[1] As of January 31, 2020, she no longer belongs to Flave Entertainment as the announcement has been exclusive on her social network.
In 2006, she auditioned for AKB48 and was cast to Team K. She was also a member of AKB48's subgroup Honegumi (the group was formed for a kids' TV show in 2007).
The song was used as the end theme to a NHK Educational TV's anime called Ojarumaru.
[3] She played minor roles in the AKB48 dramas Majisuka Gakuen (2010) and Sakura Kara no Tegami (2011).