Oga's Battle (男鹿の戦い , Oga no tatakai) is chapter 106 of the Beelzebub manga.
Summary[]
Oga prepares to fight Hecadoth, Graphel and Nāga with the new techniques he learned. Wielding Alaindelon like a club, he lunges at Hecadoth, who easily punches Alaindelon away. He then asks Hilda to stand aside and let him and Beelzebub handle the three. With admiration at Beelzebub's maturity, Hilda complies. Oga then uses the same technique Saotome used to fight them earlier on Hecadoth: the Zebul Emblem, in which after the enemy is beaten up by the user, the enemy begins to develop explosive power and eventually explode. After Oga makes Hecadoth explode in mid-air, he targets Graphel and Nāga next and claims to know another technique that can beat the both of them.