Akutabe, a detective, summons devils to solve the troubles of his clients. One day, a low class devil Azazel Atsushi is summoned by Akutabe and is used harshly by him and his assistant Rinko Sakuma.
Lucy, Natsu and Happy, are on a mission to find a troublemaker and deal with her. Due to unknown circumstances they get separated. The same happens to Elie and Haru, from Rave Master . Lucy and Elie try to find their respective partners..