Artist's commentary
Miku and I, Lesson.
My Miku hasn't been trained enough and is a bit tone-death, but I found out that for some reason wearing glasses makes her sing better.
But right afterwards, she tripped on a manga book and fell over.
The data from the song she memorized got wiped out and in the end things went back to square one.
As expected, it was the glasses' fault she couldn't see it...