Oga returns home after being defeated by Tojo to find that Hilda has returned from the Demon World with the imperial doctor, Forcas Rachmaninoff, and his assistant, Lamia, to help determine the cause of Beelzebub's illness. He diagnoses the illness as King Fever and when Beelzebub was trying to draw out massive amounts of demonic power, he accidentally severed the link between him and Oga and found Tojo similar to Oga and connects to him. Oga begins a treatment to try and reconnect with Beelzebub and enters a dream world through the effects of a Demon World drug that is shot into his head where he eventually finds a sleeping Beelzebub in the middle of several inscribed circles that are shrouded in an electrical field. After about 6 hours of treatment, Oga still has not waken up and Lamia assumes that he has died and becomes happy. Oga suddenly wakes up and spanks Lamia and claims he is teaching her some manners. Hilda asks Oga how he feels after having gone through the hard part of reconnecting with Beelzebub and Oga says he is in the mood to get Beelzebub back.
Vaincu par Tôjô qui garde toujours Beelzebub avec lui, Oga rentre chez lui où il retrouve Hilda. Celle-ci s’est rendue aux Enfers afin de demander son aide au médecin de la cour, Forcas Rachmaninov, et son assistante, Lamia. La maladie de Beelzebub serait en fait une fièvre royale due à un trop-plein d’énergie que Beelzebub aurait contenu pour ne pas tuer Oga. En clair, celui-ci va devoir mûrir en tant que parent pour sauver l'héritier...
Después del terrible combate contra Tojo y el abandono de Bebé Beel sustituyéndolo por Tojo, Oga regresa a casa y allí se encuentra con Hilda que regresó del Mundo de los Demonios con la compañía del Doctor. El Doctor explica que se trata de una Fiebre Real cuyo poder de Bebé Beel se hizo demasiado grande para que Oga lo controlase y para que ese poder no se transfiriera a Oga, Bebé Beel cortó inconscientemente el vínculo que mantenían.
Arrivano i dottori dal Mondo Demoniaco, una melma gelatinosa e una tappa di nome Lamia. Ti prego, porgi l'altra guancia.
