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It's because of 'Shkanon'. Shannon and Kanon have the same body. It's one person holding two keys, so once that person's body can be confirmed as dead, then the 'Kanon personality' dies.

Asked by Anonymous

But I thought it was promised that Bernkastel’s game was just a simple mystery—and that it’s solvable from within the game itself? Regardless of whether Shkanon exists, there’s no proof of it within Bernkastel’s game, so I would still consider Kanon as real in this instance.

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