A bit of spoilers from what we know from other sources :
- We start the story in early September (after Accelerator was shot in August 31th, before DA got wiped in mid-September). At this point the guy is supposed to be pretty much a boring jerk and only thinks of beating Accelerator. He has a bit of "screentime" in the Daihaseisai later on.
- October, Battle Royale happens, then his existence is basically reduced to a brain for the purpose of mass-producing darkmatter. I believe we will have a time skip rather than arcs about people using his abilities.
- November, Agitate Halation project, a lot of things happen but at the end he's revived with a completely different personality. Later on in the same month, I haven't read the novel at this point but it seems they have some material with the Othinus arc.
Anything/Anyone else should be original to this manga (first time we see Yuzuriha Ringo). I'm still iffy about starting his storyline before Agitate Halation.
Beetle-san Episode (-1) was a fine read. Much better than Ep. 0 imo (mainly because he's a piece of shit in that one, which even if it sets the redemption arc in Beetle-san Origins, is still a dick move).