A campus inspirational novel that combines "Group Portrait", "Micro Fear" and "Dream Chasing"!
Five first-year high school students inadvertently broke into a liminal space that appears only when the sky enters the "Blues Hour" in campus legend - the "seventh floor" of the school that should not exist. It is mysterious and weird, psychedelic and makes people easily lose their way... But they must find the exit numbered "C710" before the city is completely shrouded in darkness. Otherwise, all traces of their existence in this world will be completely erased and completely forgotten by the world.
What is the way to escape from the "seventh floor"? Do they still have the chance to return to the real world that once made them feel normal but now they are looking forward to it? Everything will be revealed only when the blues recede and darkness falls.
