The formation whithin SiAM&POPTUNe recently changed.
One of the members, Hamada Nana (濱田菜々), had announced her graduation on February 2, which took place on March 20 during the SiAM&POPTUNe tour (held in Tokyo, Nagoya and Osaka respectively). On the day of her graduation, a limited press single of the group Kimi ni Hirari (キミニヒラリ), in which Nana performs a solo version of the title song, is distributed in concert.
After this departure, the idol group staff decided to recruit new girls.
Three new members, Kobayashi Mizuki, Endo Miku and Masuda Kotone, joined SiAM&POPTUNe on March 25 during the tour. They are the youngest members of the group, they were still only trainees.