The most relevant of what happens in the Fifth Volume or World, in this case would be that of Show by Rock! The most important moments will be discussed, as well as the characters that should have more relevance and the respective arcs. Preferable to read before or after finishing Volume 5.
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W͇o͇r͇l͇d͇ ͇5͇:͇ ͇S͇h͇o͇w͇ ͇b͇y͇ ͇R͇o͇c͇k͇!͇
M͇e͇l͇o͇d͇y͇ ͇W͇a͇l͇k͇ ͇A͇r͇c͇
Important Characters:
-M
-Ailane
-Hiro
-A
-Xerzene
-Eve
Important Events for the History:
-A is the first prototype on the way to the perfection we want to reach, as you can see this follows a pattern that would be the alphabet, then we could take that A is the weakest and Z would be the strongest, but just seeing that -A became so powerful and that was only the first step, the parasites known in the future as Z will be even stronger and with skills of all kinds, as well as -A got to get an ability to cope with Hiro.
-The name of Xerzene who is the antagonist and main villain of the whole story is revealed, he is represented as a being without form since he is just recovering his power, later in the story he will have a definite form but in a varied way at the same time, literally every being who sees Xerzene will see him differently, since these beings like Zarama or Xerzene do not have something concrete as such, the others will see him as they want to refer to them. If someone wants to see Zarama as a chicken and that is what he imagines, then he will see him as a chicken, if Zarama did something that made a person happy, this person will see him with the form that he appreciates the most, either his mother or father or who he loves, but if these beings did horrible things and already have a bad image of them, people will see them with the form they hate the most in their heart, and we all know at this point who is the person that M hates the most in his whole life.
-Hiro in the future will have an even more important role and it will be nothing more and nothing less than in the beginning of the decisive story, the End of the Beginning Arc, here Hiro will contribute a lot to the story doing what he always does, trying to save the day or better said, save the whole existence, so we will be able to enjoy Hiro and his silly way of being but that will be even more far ahead.
-Kiara will also be involved in the arc, so let's just hope they get out of it.
-Here it is implied that M has connections or can see other realities that have happened or are happening at that time, little by little we will go deeper into the history and events that happened in another part of existence.
-The being known as Eve, I will only say that is the being who started it all as well as it will be this same who is when it all ends, its existence alone is who started the story.