Hilda comments after looking at the crest that the amount of energy it used would have driven a normal human mad. While visiting the park, Oga then meets a girl named Aoi and her brother, Kouta. Oga asks her immediately to go out with him, which causes a misunderstanding that stays within Aoi's heart. Oga tells Beel to fight Kouta, possibly as a joke, but Kouta accepts the challenge and easily pushes Beel off a bench. This event sparks a rivalry between the two babies. It is later revealed that Aoi, who was in disguise the whole time, is in fact Aoi Kunieda, then, the leader of the Red Tails and another member of the Touhoushinki. Aoi, who was then away from school during the earlier events of the manga, has returned to Ishiyama High to defeat Oga in order to prevent him from causing any more trouble within the school. When they encounter each other in battle, she realizes that she has already met Oga in the park, but he doesn't recognize her. After he dodges her attacks twice, he notices Beel's interest in Aoi and asks her to become Beel's mother. Although he means for her to replace him as a parent, his request causes another misunderstanding similar to the one in the park. The fight is postponed, and Hilda soon arrives to give Beel his milk. The MK5 make their debut in the story, only to be defeated in a five panel pattern which appears again later in the story. After the fight, Beel senses something which turns out to be the last of the Toushinki, Tojo. Oga, however, does not notice. Aoi sees Oga and Hilda's fight with the MK5, and believes the rumors that they are husband and wife. She is challenged by Hilda to a fight so she can test her ability, but the fight ends quickly with Hilda deciding that Aoi isn't on the same level as Oga. At the same time, Oga is confronted by Chiaki and Nene. Two female students tell Aoi that Oga injured the two of them, which later turns out to be MK5. Aoi fights Oga to avenge her two classmates, while Oga assumes that she wants to accept the role of becoming Beel's parent. At the same time, Nene wakes up in the infirmary and goes to warn Aoi of MK5's trap, which turns out to be Miwa's scheme.