Rima, Yaya, and the Pearls that Bind Them.

It is summer vacation and Amu reflects on the time since the school year began. Meanwhile, Kairi is preparing to go back to his parents while reflecting on his time with the Guardians. Later, Amu, Yaya, Rima, and Tadase go to visit Kairi and help Utau and Yukari move into their new office.

Synopsis excerpt via Kitsu.