Saving Blue Star Starts with Becoming a Challenger

He was sitting in class as the system integrated Earth into the larger universe, a simple teenager until he became the Challenger. He didn't know what it meant to choose to be a challenger. But when he teleports to Challenger Tower, he must face challenges from those who have known the system since its birth. Opportunity may have kept him on his feet, but now he must win every challenge he faces if he wants to save his world.