First day back after the holiday break, only a few months of high school remain. But a strange announcement derails everything from then on.

Set in a parallel world, a young man sees his life and future changed in ways he had never imagined. All people over the age of 19 vanished, abilities and physicalities beyond what was normal are displayed by those who remained, and rules are imposed to accommodate the new order, eventuating a struggle for survival and supremacy unlike any before. Shrug into his uniform as he navigates his new reality, the whims of the masterminds behind the reformation, and the desires and intentions of every other teenager just like him.​