damm no one investigate mc for real he have the right to talke .... boring
i think there's two key evidence against him:
1) he was literally 'caught in the act' (which was holding the knife that was still thrust into the body) by the most reliable witnesses: the police
2) his fingerprints are on the knife. assuming that it was the murder weapon and no other fingerprints were discovered there, it's pretty much 'decisive'.
and well, if you assume that he was basically wandering around prior to being discovered by the police, he had no solid alibi during the murder. so that's a third 'decisive' proof against him too.
so yea, even if there was an investigation, the results might just be the same if the killer was really that thorough.
and from what i learned from ace attorney (since it has a semblance of how japanese courts work), it's guilty until proven innocent.
that's what i assumed to what have happened anyway since the transition was just too quick.
And you know what? there is the thing with her sister asking *him* "why?". as far as his sister is concerned he was the one who did them.
We might have a MC with personality disorder, he was talking about apologizing to his family for getting irritated and angry. Truth is, we got just pieces of information right now xD
this manga need update