Part 1: Bad Reasoning

It felt strange to assume the game room is a sealed room.
Huh?
It would be more reasonable if we assume it’s just Yoshiko’s delusion or there is more than one key.
Uh… That’s Sigma’s reasoning…
Yep. What concerns me is the leader of Kurogami being killed from behind, so I came to me, Shizuma wasn’t attacked.


He used his death as the closing curtain to this incident.
What about other events?
Obaba’s death should be the poisoning from the meal. Shizuma probably poisons it while he murdered Yuriko. Obaba did said “I happen to passed by and notice the meal is already prepared.” Even if it’s related to Yuriko, if the room is not a sealed room, then Shizuma can be the murderer.
But it looks like a sealed room.
That’s what it mean to not judge a book by its cover. To sum it up, after that, Shizuma killed Yoshiko, and end his own life. Q.E.D.

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That means… Only Yoshiko can kill Yuriko.
That seems to be the case.
Obaba’s death should be the poisoning from the meal. Yoshiko probably poisons it while she murdered Yuriko. . Obaba did said “I happen to passed by and notice the meal is already prepared.” Q.E.D.


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(This reasoning lack the dumbwaiter clues and we didn’t found Nene)

First is Obaba’s death at 1800… Where there a problem? Who could have hid the body? To be honest, I don’t have the answer to these questions.
Ha? Then what is the conclusion of your reasoning?
The conclusion is I don’t know. However, there’s one possibility. A possibility that someone might have did something…
Who?



The culprit is… Nene
… Is that right… Why would you say that? Just because we didn’t see Nene in the time re-occurrence, you can accuse her as the culprit!? What kind of conclusion is this! Do a better job on your reasoning!
Why would you say that? This is the conclusion I gotten from my reasoning. Now, begin time tuning!