Summary:

Three hundred years after humankind almost went extinct, a new society was born from the ashes of the old society. Everyone believed only five people survived the incident three hundred years ago. They might be wrong, and they might learn the truth, but it might not be what they want to know.

A teenage boy prodigy, A501, living in the refuge is predicted to be one of the next leaders. Unknown to everyone else, A501 has a hobby of studying subjects that are considered illegal. It was just another day when this prodigy had a chance encounter with a strange girl. And just like that, a series of events triggered with them at the center.