 On March 4, 2009, their first-ever collection of video works, "Tottemo Ēzō", was released.That year, Mizuno was put in charge of writing the song "Yell" as the set piece for the junior high division of the 76th annual NHK Nationwide School Music Contest.Their 15th single "Yell / Joyful" came out September 23, taking the No.