Encountered a mysterious black cat after evening self-study get out of class? ! Damn, this plot is too cliched - the black cat is my bodyguard and I am actually his highness? The mysterious disappearance of a friend, the beautiful princess imprisoned by the moonlight, the fragile and repressed love, and the choice of the afterlife in order to escape reality. Is it a curse? Or is this the original color of the world? The war will only break out after evening self-study.