This oneshot is underrated and needs more love. This has potential to be a serialized manga.
It's like Batman with Shioso's commissioner Gordon being the rookie cop Akari and if this gets serialized, Shioso would be considered both a fugitive, a vigilante or even a hero with the public having split opinions on him. He might go Mystogan with a mask to hide his identity and even fake having a twin brother.
I feel like in the earlier chapters in a hypothetical serialized manga, Akari would usually get involved in some trouble due to her association with Shioso and in later chapters the rookie cop Akari will toughen up to show that she didn't train to become a cop for nothing and would save the day. She might even save Shioso when he's in a pinch. Plus there's a potential for a cute romantic subplot between Shioso and Akari.
If this gets serialized, maybe in the early chapters before meeting Akari, they can show Shioso actually killing some heroes earning his public reputation as "The Hero Killer" before his encounter Akari and Go changed him into a different kind of Hero Killer.