The delinquent group, MK-5, come to confront Oga, but are promptly beaten by him and Hildegarde, who catches the attention of a smitten Aoi. As Aoi's right hand ladies, Chiaki Tanimura and Nene Oomura confront Oga, Hildegarde, who had heard from Oga about his plans to dump Beelzebub onto Aoi, challenges her to a fight to test her strength. When Aoi returns to find Chiaki and Nene injured, she assumes Oga is responsible and confronts him in a fight. In actuality, Chiaki and Nene were attacked by MK-5, under the orders of Miwa, who desires the title of Queen. Shintarou helps Nene get to Aoi to tell her the truth, but when Miwa makes his move, Oga promptly beats him up. Afterward, Aoi is once again baffled by Oga trying to give her Beelzebub, explaining that he's forced to raise him because of Hildegarde. Later, Aoi decides to quit the Red Tails and put Nene in charge, feeling that she is no longer able to serve as their leader.

男鹿知道邦枝的实力后, 一心想要把小贝鲁丢给邦枝接手。另一方面, 邦枝的手下宁宁跟千秋, 发现邦枝对男鹿可能有好感, 于是去找男鹿把话说清楚,却被其他女学生发现宁宁跟千秋受伤不醒人事! 难道是毫不留情的男鹿干的好事吗?

Oga n’a pas renoncé à se débarrasser de Beelzebub et reste convaincu que Kunieda est une bonne cliente. Elle-même est troublée par ses deux rencontres avec Oga et semble incertaine des sentiments qu’elle nourrit à son égard. Tout cela n’arrange pas du tout ses deux subordonnées Chiaki et Nene...

La Regina è caduta nella trappola degli MK5 ed ora è sul tetto della scuola, dove si scontrerà con Oga. Nel mentre Baby Bell: "Colpo della Divina scuola di Okuto", miao.

クイーン・邦枝葵に、ベル坊を押し付けようと意気込む男鹿から、葵の強さを聞いたヒルダは、彼女に興味を持ち、その実力を試そうと考える。そんな中、石矢魔の生徒でさえ近づくことを拒む、マジで空気読めない５人組こと、Ｍ・Ｋ・5（エムケーファイブ）が現れ、その名のとおり空気を読まず、男鹿とヒルダに絡んできた。ヒルダはＭ･Ｋ・5を瞬殺。一部始終を見ていた生徒たちを「最凶夫婦」とビビらせると、そのまま葵を探しに行ってしまう。そして出会ったヒルダと葵は！？一方、葵を慕う大森寧々（おおもりねね）と谷村千秋（たにむらちあき）は、葵の男鹿に対する煮え切らない態度に危機感を覚え、何とかしなければと考えていた。そんな折、寧々と千秋が何者かに倒され、保健室に運び込まれる事態が発生！寧々たちが男鹿と話をつけに行くと言っていたと聞いた邦枝は、ふたりを倒したのは男鹿ではないかと考え怒り心頭！！戦いを挑む。ところが、当の男鹿は……？？