Well, I could say one for now. (My schedule! Also, this mostly connects to effects and involves spoilers.) It's possible that Soutarou was arrested for a crime he did not commit. (I now have three theories, one of them he really commited the crime.) It's also possible that he got executed for that crime or because of symbolism, he got ruined for it. First, in the Inorganic World, can't you hear the background music? It sounds like a crying baby that gets harmed. It's possible to link that to it. The Brass Knuckles, too. (Maybe it's kind of possible to link it to the chasers as well? They possibly accused him first or gave him the knuckles, or something, to be honest, I haven't thought of the interpretation a lot due to how busy I am, but maybe someone would help or I'll think about it again.)
His reputation is growing bad, and he got accused. It's possible that he ran away and stayed on the apartment due to the place where you get the Picture Frame looks like a mansion. (Though it may not be the only place you get it, not sure dude.) They also thought he was lying, so the way the picture cracks could represent his reputation being "breaked" and the black cat could mean (He is getting popular for the false accusation?) he was called "bad luck" by people either close to him, etc. The cage make him look like his neck and limbs is being locked up. The chains could also do something with this. The Corpse effect is the possible result, due to Soutarou having no head or limbs. (Or what he would possible face if he left his apartment? It's also possible some happenings in the events could be related to his fear, anxiety, and possible regret.)
The black hair changing into white hair is possible that time has passed a lot? Plus there's also a Katamari or Oil effect. Soutarou was maybe givena chance to think about it or something made him end up in that apartment where he ran to. Maybe the way the game ends him being dead is him being killed off finally for the false accusation. The girl in the third and fourth ending might involve something with Soutarou. Here's what I could think of for now.