When he saw a mysterious message about "Angel Apartment" on a campus forum, he thought it was just a prank. But then the girl appeared before him, armed with a dagger capable of instantly severing objects. His peaceful campus life was shattered. A solar eclipse was approaching, the shadow of a secret organization loomed, the mystery of the evolutionary chain emerged, and his fate had already been entangled in a game that spanned the campus and darkness. This encounter, which began in the classroom, was destined to uncover a truth far more cruel than the textbooks.