Once again My Brother's A Devil continues with book 3. Ava has mail from an old friend that she made while training to be a vampire hunter. Her coliegue, Iris is a current member of the host club at Ouran High School. Since then, she's been very sucessful. Both girls are reunited for a visit with both groups on a vacation. But their vacation is over when they figure out that the Mukami brothers need both, Ava and Iris out of the way for their plan to work. With the help from the devils, Lindo and Ritska, and the Sakamaki's, will they stop the Mukami's before their plan works? Join the group for another story as they have trouble with the Mukami's.