Taking care of a baby? Or exorcising your house? Name it, you got it. Just call this number, and the CAST will come to your rescue.

Nanase Yuuki, the owner of the odd company CAST – a one – man company that will do anything just for money. He likes to work alone, but was joined by a guy named Aoi when he saved his life. Their job became complicated when they saw a murder happen under the subway and hired to find and protect this killer.

Will Yuuki decline his client's request, or break the law and protect the killer for money?