They also performed as a concert-only unit until 2011. In 2013, they reunited for a one-off performance in 2013 for Hello! Project's 15th anniversary alongside Hitomi Yoshizawa.
The text describes a shift in the group's activities. They were initially a concert-only unit until 2011 and then reunited for a one-time performance in 2013 to celebrate Hello! Project's anniversary. Hitomi Yoshizawa was a guest performer at this reunion.