A murder occurs in an apartment. The victim is a famous detective author. A card left in the scene shows that the somebody who called himself as character of the author's detective novel took the life of author. The two suspects were pointed: the guard of mansion who like to drink some wines despite of claim of author, the editor of the publisher who claimed that the author was alive when he left the room. After finding the evidence through the sushi, the culprit was revealed to do it out of love for the author's mystery.