As Kanzaki tries to come up with a new special move to beat Tatsumi, his followers suggest the key to Tatsumi's power is having Baby Beel on his back. Thus, Kanzaki starts training with a weighted baby doll on his back. When that plan does not work, they try finding a living substitute, which end in more embarrassing results. Meanwhile, Tatsumi takes Baby Beel to the park where they once again meet Aoi, who has lost track of Kouta. Kanzaki coincidentally finds him and deems him a worthy substitute for Baby Beel. While playing with him, he figures out the key to performing his new special move. After returning Kouta to Aoi, Kanzaki performs his special move, though it just leaves everyone confused. As Kanzaki leaves, Tatsumi admits his move was surprising.
—Wikipedia