"At twelve o'clock at midnight, when you see another version of yourself in the mirror - remember, it may not be 'me'."
Mocha, a seemingly ordinary high school student, has an unknown secret: she has been able to see "those things" since she was a child. Under the curse of extremely yin constitution, ghosts are not legends to her, but daily life.
Late at night when she couldn't finish her homework, the palm-sized old elf Lingweng broke into her life and brought with him a strange contract - to be a ghost-washing cleaner in the Department of Ghost Realm.
From then on, Mocha began a dual life of going to school during the day and working at night:
Purpose: To redeem ghosts trapped in the human world due to obsession