HKT48 Team KIV captain Ota Aika (多田愛佳) goes back to black hair, her new dyeing hair style was revealed on twitter of Mr. Samon who is Hair Salon "RISELw/u" shop manager at 7 February 2016.
Mr. Samon's original tweet:
HKT48の多田愛佳ちゃん����
ツアーの衣装に合うように髪を暗くしましたよ✨清楚な感じに仕上がりました����#risel#riselスタイル#HKT48#akb48#多田愛佳#らぶたんpic.twitter.com/CqIgYZkquM - RISELw/u佐門 (@riselsamon) February 7, 2016