The All-Out Showdown

is volume 7 of the Beelzebub manga.

Chapters
053. The Quiz (クイズです, Kuizu desu) 054. Kanzaki Hajime (神崎 一, Kanzaki Hajime) 055. Everyone Go Home (みんな帰ります, Minna kaerimasu) 056. The All-Out Confrontation (全面対決です, Zenmen taiketsu desu) 057. I Don't Know You (てめーなんて知らねー, Temē nante shiranē) 058. Latecoming Man (遅れてきた男, Okuretekita otoko) 059. He Came (あの人が来た, Ano hito ga kita) 060. Strongest (最強, Saikyō) 061. The Next Fight Is (次の戦いは, Tsugi no tatakai wa)