Project 2015 Winter concert series, it was announced that a new unit consisting of Rio Fujii, Ayaka Hirose, Minami Nomura, Rena Ogawa, Ayano Hamaura, Natsumi Taguchi, Sakurako Wada, and Rei Inoue, was formed.

[2] On March 8, it was announced that the leader and the sub-leader of the unit were determined as Ayaka Hirose and Rio Fujii respectively.

[6] On February 17, 2016, the group released their second single, "Sakura Night Fever / Chotto Guchoku ni!

Project announced that Rena Ogawa would take a hiatus from the group's activities due to anxiety neurosis.

Project announced that Natsumi Taguchi would no longer be part of the group for not complying with the rules and as a result, her contract was terminated.

[15] On August 8, they released their sixth single "Kitto Watashi wa / Naseba Naru".

[18] On March 4, 2020, the group released their eighth and final single, "Seishun no Hana / Start Line".