From Clockwork Lies:

The girl that the protagonist is in love with was attacked by a rapist. However, the protagonist couldn't save the girl and even lost his own life in the struggle. He found himself in the hospital of hades (the other world) after his death and met a strange doctor in that place. The doctor made an offer to him. He will be given a chance to revive and return to the human world if he makes a contract with the doctor... What will he choose, and what exactly is this contract?