Oh I just wanted to elaborate more in this 'curtain call'.
In an orchestra/symphonic band concert (trumpeter here!
), a curtain call is when the concert ends, and the audience will be clapping etc... and there will be several rounds of the conductor coming back to the stage to receive flowers, and if there are guest conductors/players, they will also come back (only one person at a time though) to receive flowers.
But I doubt Ayu is referring Curtain call to that... it's still a nice name though. Reminds me of End roll, which is beautiful too.