I call bullshit for several reasons:
1) Murai should be dead as fuck. He had major injuries on the back of his head, where the most vital parts of the brain (Medulla, Pons, Cerebellum, etc.) and is shown with a fuck ton of blood coming from the front of his face. It then takes several minutes for the authorities to be alerted when he's in this state. Granted, they do a dummy move by not checking his pulse, but lying face-down is probably going to restrict your airflow somewhat.
2) How the fuck did MC get crippled but the girl IN FRONT of him in the head-on collision get out with only minor injuries? This doesn't make much sense considering the impact should have reduced amount of force he faced from behind. I hope it gets explained that like she jumped off the bike or had protective gear or some shit, because this is just dumb.
3) It's really convenient that Shiiki just so happens to show up just as MC is about to tell the Police Officer about Tsubasa. Hell, even if he did, it probably would be the best outcome as he'd go into witness protection. The worst they could get him with was incitement to violence, but he didn't do it intentionally-nor would anyone really give him such a strict sentence for what he thought was just a hypothetical-and he'd probably willingly take that hit because it not only means that his friends wouldn't be killed off, but that the police could use their resources to hunt down Tsubasa.
4)How the fuck does knowing someone connected to another incident signify that you were involved in a homicide? Do police officers know of guilt by association? It's like saying "my friend managed to get out of the twin towers on 9/11," and "I'm related to someone who is involved in a murder" somehow means "I'm guilty for homicide." The officer has some screws loose, it seems.
Side note but last chapter he grabbed MC and picked him up by his collar. Why?! He's already hospitalized in a wheelchair. It's just gonna draw suspicion onto yourself and get your ass accused of police brutality. There's no need to intimidate him like that when he's already crippled. There's nothing he can do and you are already in a position of physical superiority over him