The girls, whose story developed over the course of the 3 previous arcs, met together again.
One of them saw that the other was wearing a necklace, which had been given as a sign of their mental intimacy. It became clear, the one was remembering her.
But it couldn't go on like this. Each needed to move on.
And so they spun in a farewell love dance. It was beautiful and sweet. But at the end, the necklace broke and scattered all over the floor. The relationship was over. And this accidental sign was proof of that...