A mysterious being who appears whenever people are desperate for help and she forms binding contracts with them. Even though , the cost of consequences is not immediately apparent to the contract signer, they will eventually know their terrible mistake. No one is certain what game she is playing but it is much larger than anyone can comprehend.

The wife of Atid. She is a housewife and has been happily married to Atid. However, as of late she felt dejected due to him focusing on his career. Despite that, she accepts it and tries her best to support him.

One of the key characters of the story. He is a middle-aged office worker who was recently promoted to a higher position till suddenly his office was attacked by a monster and is offered to sign a contract by a mysterious figure to stop this monster. Due to unforeseen consequences, he was signing it blindly.