That

is chapter 6 of the Beelzebub manga.

Summary
In a bathroom at Ishiyama High, a student tells another of Tatsumi having beaten Hajime. He mentions a rumor in which wherever Tatsumi goes, grass won’t grow, like he’s from hell. They hear a figure pass through the door to the bathroom. Peeking outside, they find Tatsumi complaining of tiredness. In horror, they also find behind him two rows of five students kneeling against the walls with their heads to their upper torsos smashed in, as well as four more students left hanging from the ceiling with their heads smashed up.

Since Beelzebub was crying so hard, Tatsumi couldn’t get any sleep last night. Now, he finds himself lost within the school with Beelzebub sleeping soundly on him. Holding his right arm up, he finds a red mark on the back of his hand, thinking it’s blood. Hildegarda comes up behind him and identifies the mark as “that”. Alaindelon also comes to him and becomes fascinated by how “that” came out so quickly. Startled by their sudden presence, Tatsumi jumps back and asks why they’re here and what “that” is. Both calm, Hildegarda and Alaindelon comment on Tatsumi’s reaction. Hildegarda tell Tatsumi they’ve brought Beelzebub’s milk. Hiding behind her are three students identifying her as who they think is Tatsumi’s bride, a gothic Lolita. They run up to Hildegarda and taunt her for her looks and for being a young girl. When the three students see Tatsumi in front of them, they immediately bow down in front of him and apologize for messing Hildegarda. Unsatisfied by their apologies, Hildegarda tells the three to be quiet, takes out her sword, and blows them away. As Hildegarda leaves with Tatsumi and Alaindelon, other students are stunned at the hole she left in the wall, confirming the rumor that she is Oga’s bride.

On the rooftop, Hildegarda and Alaindelon tell Tatsumi and Takayuki of Tatsumi’s contract spell or seal. Tatsumi had apparently been accepted by and made a contract with Beelzebub. To Tatsumi’s realization, Takayuki asks the two why a human needs to be Beelzebub’s parent when Hildegarda, a demon, can be his parent instead. Alaindelon answers his question by pointing out that Beelzebub needs a catalyst, a human, to display his powers among the human world, like a power line conducting electricity. Hildegarda summarizes this by explaining that the more Tatsumi treats humans poorly, the more he becomes a true demon king through the power of the seal he made. Hearing this, Tatsumi and Takayuki become terrified.

Around Ishiyama High, students are still spreading the word that Tatsumi beat Hajime and that Hildegarda is Tatsumi’s bride. Shintarō and Shiroyama contemplate Hajime’s status as the lowest member of the Tōhōshinki. Hajime and the silhouettes of the other Tōhōshinki members (Himekawa, Kunieda and Tōjō) are revealed. Shintarō plans to leave Hajime’s group, but Shiroyama plans to stay with him. Three students walking down a hallway converse of Tatsumi’s upcoming confrontation with Tatsuya Himekawa when they find Tatsumi in front of him. With an evil smile, Tatsumi proclaims that he hates violence and walks off proclaiming he wants to be friends with everyone. Elsewhere within Ishiyama High, a student hands Tatsuya a picture of Hildegarda, supposedly Tatsumi’s bride. Tatsuya's face is revealed. He is fascinated by the picture of Hildegarda.