Who is the Culprit?

Hello everyone, I'm going on a hiatus from my yet nameless story to bring you an analysis of one of my favorite vocaloid songs. The name of this song is, The Riddle Solver who can't solve Riddles.

To make things clear some cannon should be established. The videos going along with the songs are completely fan made, and therefore cannot be used to find the authors meaning of the song.  The lyrics also are translated from the original Jappanese into English and may also contain fallacies. As for the setting, which isn't made clear by the lyrics, was found after digging around. The original composer of the song sated for the setting that it takes place at a, "fancy party on a boat by an unknown benefactor". With these facts in mind you should now watch the video before we continue (watch it here)

The story seems pretty simple doesn't it? There are two people talking, a detective and girl, and they are discussing the murder of a man who was poisoned. As the detective explains the crime it becomes apparent that the only possible culprit is the very girl who he is talking to because, "The second mystery is, why did they fall into the ocean?" which implies that everyone besides the two of them is dead. This idea is further cemented when the girl grabs a knife in her pocket and attacks the detective. That is until the song makes a complete 180 and the detective is then confessing about how he committed the crimes, telling the girl repeatedly, almost insistently, that he is the culprit and she should run now if she wants to live.

Now what is in there to possible analyze, why wouldn't we know who the culprit is? He explictly stated that it was him. But this isn't the whole story, there's actually a sequel song told from the girls point of view that helps reveal the REAL culprit. (watch it here). Some things to keep in mind when watching this video is that, once again, the video itself is not cannon, some portions of the song reference other songs in the series that will not be touched upon for a lack of need, and not everything said is the truth.

Shocking isn't it? Most every line of this song reveals a deeper meaning and needs to be deconstructed. The first thing to be mentioned is the difference in tone between the first riddle solver and the second one. While the first one had an almost upbeat tone to it, one that might reflect insanity. The second one however takes a more sad and remorseful tone. The girls tone towards the detective also is very different. She takes a familiar tone with stating how he always was like that in some way shape or form.

The words she tells themselves also hold massive weight to them. When the song opens she says, "Why do you always insist on getting yourself hurt? And think that you could protect someone like that?" At first this line doesn't seem to make much sense, but in actuality is the key evidence for the culprit. Rin, the aforementioned girl, continues, "In the beginning it was you who blind-folded me wasn’t it? There were actually two wine glasses weren’t there. Even if he didn’t die by “poison”. He would’ve eventually died by the “knife”"  The entirety of these lines is symbolism. The blind fold may represent an actual blindfold, but it is also more likely that it represents a trick, a trick the detective played on Rin. She goes on talking about how there were two glasses of wine. From the first video we know that the first victim died by drinking poisoned wine. Rin stating that there two glasses implied that the poisoned glass wasn't the original glass of wine, meaning victim one didn't die of poisoning. So what did he die of? Rin even tells us this, saying if he didn't die of poison, he would've died of a knife. Now, who is the only person in possession of a knife? Rin.

Does this mean that Rin is the culprit? Just because she hints at killing with a knife? Well Rin goes almost to the point of saying that she is the criminal, stating to the detective, "I will solve you and your riddle. The atrocious culprit is not you.". We mustn't forget that in the first song the detective, to be hence forth known as Len, is telling Rin to shout out the name of the criminal. In response to this Rin tells Len that the "atrocious culprit" is not him.

Now that both songs have been analyzed individually, the only way to complete this puzzle is put them together. However both sides seem to be insisting to the other that they are the culprit. The answer really isn't that complicated. The culprit is, BOTH LEN AND RIN! This is actually quite apparent when both songs are understood. Lens song only makes sense after hearing Rins. He states that only Rin knows what happened because it all happened in front of her eyes. While at first it seems that Rin witnessed the crime, Len is actually implying that Rin committed the crime, hence why it happened in front of her eyes. He later tells Rin that she should run away to avoid getting hurt, basically telling her to leave before she's found out to be the murderer. This brings up the question as to why Len is telling Rin he's the culprit and telling her to run instead of turning her in. 

In Rin's song she literally states that she's the culprit more or less, as I've already explained. But she also reveals Lens intentions from the first song. She asks him, "Why do you always insist on getting yourself hurt? And think that you could protect someone like that?" This reveals that all Len is trying to do is take the blame off of Rin in order to protect her.

So Rin's the culprit, we get it, but if that's the case why did you also say Len's the culprit too? Didn't Rin say that Len wasn't the culprit? Think back to Lens song, how many mysteries were there? To answer my own question, two, there were two mysteries or "incidents". We know for a fact that Rin is the first murderer, but in her song when she's talking about Len she says, "He could only kill them one by one, but still couldn’t be the culprit." This is in reference to the second incident where several people were pushed off the boat and into the ocean. Rin is obviously referencing how Len killed all the others one by one pushing them off the side, but still couldn't be the culprit of the first crime. Going back to Len's song, near the end he tells Rin, 'There may be more than one answer to that question" implying that there multiple culprits for the crimes. Finally, there is a peculiarity with the usage of the word "detective" in both songs. It is established that Len is a detective, but Rin is also referred to one, and in her song she asks Len, "Were you really the “detective” in that crime?" Thus we can assume that when they say detective, what they're really saying is "killer".

Although not everything from both songs was touched upon, we can safely assume with all the evidence piled between us, that the culprit is both of them, but for different murders.