[Matrixbeast]

Hibiki Volume 5.
We get a large chunk of establishment, name dropping Zanki and Ibuki. Asumu's mother encounters a handsome young man with a trumpet ringtone, while Hibiki and his father(?) discuss that the demons they're fighting are more vulnerable to string based instruments rather than drum.
In addition, we also see a new type of disc animal, a crab (Though they weren't really necessary since the crab demon literally reveals himself after the animals are deployed).

Speaking of, this demon was kind of terrible. The suit was noticeably low quality, and he was taken out by the disc animals distracting him for a moment then getting punched by Hibiki. However, the giant crab was a much larger threat, able to spew acid from multiple points on it's body (The smaller crabs could do it too, but they were bitchmade). It covers Hibiki's arm in acid, it melts his belt buckle/drum disc thing, and Hibiki is forced to dive into the water when it's back just starts to rain acid everywhere.

So, for Asumu's portion of the plot, it has him on a bit of an emotional roller coaster, relieved that he finally got to meet Hibiki once again, then on a bit of a downward drop when he finds out all his friends are excelling, then up again when he wants to hold off on meeting Hibiki until after exams to exclaim that he passed, then just shooting down when the head teacher basically tells Asumu that he has one shot, and he's probably not going to pass the exam for the specific school he wants to get in. Poor kid.