Time, Gakushuu reflects, is a human construct.
He gazes up at the natural state of the universe - the night sky, with its thousand twinkling stars, burning uselessly millions of miles away. It is cloudy and unclear, but since when has anything been clear and fresh in his mind? He finds himself connecting greatly to this natural state.
Time is a human construct. There is no real day or night. The earth came into being by chance, so did humans, and animals, and everything in the universe. The earth has always kept turning, the universe is still expanding, God's existence is still unconfirmed.
What did he treasure? He treasured grades, beating his father, beating E-class, beating his friends.
Gakushuu realizes that although time is a human construct, it's one of the most important constructs ever made. It gave him everything that was worth something in his previous life. And now that it is running out...
He isn't quite sure what to do without it.