The Demon Lord Has Come

is volume 9 of the Beelzebub manga.

Chapters
071. Secret Weapon!? (秘密兵器!?, Himitsu heiki!?) 072. I Won't Let This End!! (終わらせない!!, Owarasenai!!) 073. The Man Who Came to Destroy (ぶっ壊しにきた男, Bukkowashi ni kita otoko) 074. Out of Endurance? (ガマンできる?, Gaman dekiru?) 075. Back to Back (背中合わせ, Senaka awase) 076. The Demon King Has Come (魔王が来たりて, Maō ga kitarite) 077. The New XX (新しい〇〇です, Atarashii __ desu) 078. Saotome Zenjūrō (早乙女　禅十郎, Saotome Zenjūrō) 079. I'm Not Your Enemy (敵じゃないよ, Teki ja nai yo)