Detective Arthur, assistant Merlin. Arthur is a third-rate detective in London with unknown origins. Merlin was his assistant, who was mainly responsible for the daily affairs of the detective agency. Merlin has been in love with Arthur for a long time, but Arthur always has a ring on his ring finger, so Merlin can't express his love. One day, the detective agency received a letter from an unknown sender and addressed to "Dear Mr. Merlin." This is a letter in the name of love. The letter tells about his crazy love for Merlin. The words are obscure and dark. After reading it, Arthur said it was perverted and asked Merlin to be careful. A few days later, another letter came. This was the second letter. It said that the game has begun and I will sacrifice my life for you.
Intention: love