Amaki Riona

 (天城りおな), formerly known as Hananoki Riona (花乃木りおな) and Tanioka Rumi (谷岡瑠美), is a Japanese idol, a 1.5th generation member of Boku wa Mada Shinanai, a former member of Sweet Surrender, and a former member of Kirameki☆Unforent.

She joined Sweet Surrender, under the name Tanioka Rumi, in April 2015 and left in January 2016.

She joined Kirameki☆Unforent, under the name Hananoki Riona, on March 13, 2016, and graduated on May 13, 2018.

She joined Boku wa Mada Shinanai on September 21, 2020.

On September 28, 2021, it was announced Amaki, together with Tsukishima Senna, would graduate on October 30, 2021.