Who's Going to Beat Oga?

is chapter 191 of the Beelzebub manga.

Summary
Nasu tauntingly asks Oga to raise his voice since he apparently cannot hear what he just said. In response, only Baby Beel's head emerges from the concrete ceiling, evidently angry at Nasu. The other delinquents start commenting on how cute Baby Beel is, even Nasu, whose smile visibly disturbs the Demon infant. Moments after, Oga frees himself from the concrete ceiling and jumps down, where he asks Nasu about how much he knows about something.

Suddenly, Ichikawa draws out his sword and slices the concrete around Nasu's neck into pieces, ready to fight him one-on-one. Akahoshi is also ready to fight and he jumps into the action, resulting in a brief but heavy battle between the three delinquents. Their battle is cut short when Oga smashes a large part of the building's wall in one hit, annoyed that he has been forgotten; his action immediately garners the attention and awe of his fellow students, especially Nasu.

When Kanzaki makes a comment about Nasu, a large teenager strikes at him, but Shiroyama takes the hit instead.

The large teenager is revealed to be a part of the "Poltergeists" that make up Nasu's gang; evidently, Nasu has missed band practice, so they have come to pick him up. Remembering the time, Nasu, as well as Onizuka, take their leave so that they can start band practice. Before heading off, Nasu warns Oga that they will go head-on with the delinquents who went to Saint Ishiyama, and that he will take Baby Beel, too.

Characters in order of appearance

 * 1) Yōhei Nasu
 * 2) Hajime Kanzaki
 * 3) Tatsumi Oga
 * 4) Sōken Chabō
 * 5) Ebian Ichikawa
 * 6) Tetsuhito Kajiura
 * 7) Beelzebub IV
 * 8) Kankurō Akahoshi
 * 9) Shintarō Natsume
 * 10) Takeshi Shiroyama
 * 11) Shigeru Shigemori
 * 12) Ryō Haizawa
 * 13) Taizō Shioiri
 * 14) Teruomi Hino
 * 15) Seiji Kameyama
 * 16) Misao Onizuka
 * 17) Takayuki Furuichi