Father Switch!!

is chapter 195 of the Beelzebub manga.

Summary
After taking a sudden hit from Oga, Nasu ends up crashing into the cabinets of the classroom and ultimately destroys them, moreover leaving him in a very beaten state. However, he licks the blood on his lips as he continues to lie against the now-ruined furniture.

Elsewhere, in the basketball courts of the school's gymnasium, a young individual has a talk with someone named Sumeragi through the cell phone. He mentions how Nasu is acting accordingly to plan, then adding that he is only doing his job, as a "fellow business partner". Following a invite rejection, the young individual then walks away and wonders aloud how the "Lord of the Flies" will fare against Nasu.

Hilda and Alaindelon watch in shock as Nasu rises so as to continue his fight with Oga. While Oga makes a remark, Nasu raises his hand, and two identical clones of him suddenly appear in the room, all of which heading for the child-rearing gang leader. The two clones disappear leaving the real Nasu able to strike at Oga; his unorthodox style of punches and kicks leave Oga bloodied and utterly confused.

Nasu proceeds to berate Oga for his arrogance regarding spells even though he escaped from only one. He then explains the situation behind it as a series of horn-like tattoos begin appearing all over his body. A Magical Seal then appears around his body and Nasu says that he will show how it really is like to harness a Demon's full power, adding that Demons are supposed to be used, not to be treated in an equal like. He manages to push Oga against a wall with his Magic Seals, despite Oga's attempt to rebound with a similar technique, before then restraining him with his own hand. Nasu proceeds to violently beat up Oga, moreover explaining that Demons, as well as his crew, are to be used as tools; as such, he should simply hand Baby Beel over to Nasu. Nasu then scolds Oga for his conceited confidence that Kanzaki alone can take on the entire Poltergeists.

However, he then notices a defeated Onizuka pressed against a bookcase, with Kanzaki moreover berating the former Tōhōshinki's strength despite his former affiliation. Nasu then notices a defeated Kameyama, Shioiri, and Teruomi behind Kanzaki. The realization brings an unnerving sensation in Nasu.

He then notices Oga standing behind him and immediately Nasu moves away; as he does so, he notices that he is feeling scared. Oga mentions the "Father Switch" and then punches Nasu. Hilda and Kanzaki look on as Nasu is sent flying across the room again.

Elsewhere, the young individual has begun walking outside the school.

Characters in order of appearance

 * 1) Yōhei Nasu
 * 2) Hilda
 * 3) Alaindelon
 * 4) Tatsumi Oga
 * 5) Beelzebub IV
 * 6) Takayuki Furuichi
 * 7) Misao Onizuka
 * 8) Seiji Kameyama
 * 9) Teruomi Hino
 * 10) Taizō Shioiri
 * 1) Taizō Shioiri