@Lishy in the discord chat asked, “Has anyone solved Higurashi just from 4 question arcs?” So I thought “CHALLENGE ACCEPTED!” After each arc chapter whatever the hell, I will present my current theory based on the arc chapter at hand and the preceding chapters. I hope it will be mildly entertaining and also help me organize my thoughts on the vn as a whole. So without further ado, ridiculous unsupported theory time!
First, I believe the culprit is Oishi-san with the Knowledge Bombs in the… car! So basically people have already established that Keiichi is an unreliable narrator… probably. My earlier theory about the syringe thing suggests that maybe the syringe wasn’t even real. What if most of the occurrences were just made up in Keiichi’s mind? With all the evidence that Oishi told Keiichi in the car, Keiichi should have been thoroughly convinced that Oyashiro-sama did exist and caused all those deaths. But he refused to believe it. Or so he says. So maybe he consciously did not believe in Oyashiro-sama while he unconsciously did. This may have caused his split personality that becomes so prevalent at the end. One of Keiichi’s biggest conflicts was something to the effect of, “If Oyashiro-sama doesn’t exist, then my friends are fucked up murderers, but if he does exist, then they are just being controlled, but Oyashiro-sama can’t be real! But my friends aren’t fucked up either and my little sister cant be this cute!” So in conclusion, the new info he gets leads him to act all weird and suspicious of his friends which in turn makes them suspicious of him which makes a cycle of suspicion that may even cause him to become delusional.
Now you may be thinking? Why would it be caused by Oishi-san and not Tomitake-san? Well, let me take you on a journey of human psychology. I will try not to touch religion too much with this but its about a deity so it kinda has to. Basically, I’ve heard of people who normally do not believe of God who suddenly go to church or whatever after a big disaster occurs. Like, most people won’t acknowledge a god they if they believe it does not matter. But once something big happens, people are suddenly compelled to pray or whatever in hopes of basically getting off easy and they hope that that deity exists to save them from their troubles. So who’s to say that doesn’t apply here? What I’m trying to say here is this, Keiichi, seeing that Oishi came up to HIM and no one else, is lead to believe that he is the only one to help solve the crime because he is the next target since he’s an outsider. When he heard the story from Tomitake-san before, there was no real correlation between him and the other victims because by the logic before, only enemies of Hinamizawa would be targeted by Oyashiro-sama’s curse. But once Tomitake-san died, the logic extended to outsiders which obviously includes him. That causes his “I don’t believe in Oyashiro-sama but I do” personality split.
Ok so we know the suspect, and we know he’s delusional, so now what? Time to patch up the massive holes in this theory. Why did Rena and Mion suddenly have crazy eyes and say weird things? Most likely because again, he’s already gone insane. Why did Rena and Mion put a needle in whatever food that was presented to Keiichi? Who said there was a needle? Oh right, Keiichi. Who still may be insane and also the needle was never found. Why did Rena and Mion jump on Keiichi in his room? Remember the punishment for not guessing which one was made by Rena? Who’s to say they weren’t just punishing him by forcing him into a new ridiculous outfit? What about the syringe? Who said there was a syringe? OH RIGHT! KEIICHI! And that was never found either. Seriously though, who in their right mind uses a baseball bat to bash their friends’ heads in? No one, because Keiichi is not in his right mind. And well, he scratched his throat to death so he was probably hallucinating those people at the end too.
So there is still one more question. Why did Oishi-san kill Keiichi? Well it could’ve been an accident. Oishi-san DID say he could stop talking at any time as long as Keiichi said so. But you guys don’t think Higurashi could be explained by mere accident so my other motive of why Oishi killed Keiichi could simply be just this: Oishi was jealous of Keiichi’s delicious loli harem.
BUT HEY ITS ALL JUST A THEORY, A GAME THEORY, thanks for reading.
Holy wall of text. I might actually add more to this if I remember something. Anyways this was the first absurd theory, but there shall be more when I finish the next chapter arc whatever the hell.
EDIT #1: I had so much fun writing this stupid sh*t lol