Asia is attacked by a monster which stole her undergarments as the Occult Research Club arrives to rescue her. Facing trouble to fight that monster due to Asia's request, they managed to destroy that monster with the help of the timely arrival of Irina. Rias then receives a message from Yuuto telling them that Gasper has found the source of the magic. As they arrive to the source of the magic, the Occult Research Club and Irina decides to split into two groups with Akeno and Asia staying behind. The advanced group then encounters the individual responsible for the monsters as he reveals his past story with Issei being in awed with him.
Asia es atacada por un monstruo que le robó la ropa interior y el Clan Gremory finalmente logran vencerlo, gracias a la ayuda de Irina. Mientras, Gasper ha encontrado la fuente del ataque, que no es sino un monstruo con niveles de perversión que dejan a Issei asombrado. Pero cuando trata de atacar a sus compañeras, Issei se rebela y se enfrenta a él.
Auf dem Schulcampus geht ein Unterwäsche klauendes Ungeheuer um. Dahinter steckt der sogenannte „Legendäre Weise“, ein ehemaliger Priester, der durch einen „pikanten Unfall“ seine perversen Neigungen entdeckt und diese nun exzessiv auslebt. Hat Issei seinen Meister (der Perversion) gefunden?
