Kasai Tomomi (河西智美), nickname "Chiyuu" (チユウ), born November 16, 1991 in Tokyo, Japan is a Japanese idol singer, model, and actress, as well as a former member of idol group AKB48. In 2012, she debuted as a solo artist with the single, "Masaka" (まさか). As an actress, Kasai had a recurring role on Kamen Rider W as Elizabeth, alongside group member Itano Tomomi. Together, they made up the sub-unit Queen & Elizabeth. On December 17, 2012, Kasai announced that she would graduate from AKB48, releasing her debut single as a solo artist just days later.

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