Don't Bother Me (邪魔すんな , Jamasunna) is chapter 35 of the Beelzebub manga.
Summary[]
Beel returns and climbs on Oga's head and announces his return. He starts fooling around on Oga's head, which only annoys Oga, who warns him to stop or he will kill him. Hidetora Tōjō realizes that Oga is Beel's "father" and seems happy for Beel.
Tojo then gets serious and asks for a fight with Oga. Oga tells Beel that this is gonna be a man-on-man fight and no interference will be allowed. The two charge at each other with Oga doing a spin and hitting Tojo with his back-hand and then follows with other punches. Oga then goes for a drop kick, but Tojo blocks it with his forehead, commenting that Oga is fun. Tojo punches Oga, sending him few meters back, who then charges at Oga and starts punching him. Oga manages to land a punch, which brought Tojo to his knees. Oga notices the Zebub Seal on his had, at the same time Lamia drops a firework that misfires and heads towards Oga, but Oga blocks the firework with his hand.
Tojo is amazed, wondering who Oga is, but Oga yells at Beel as he had told him not to interfere.