[Dlanor .A. Nox]

Originally Posted by LyricalAura

A little modification:

Beatrice is aware of Battler's sin, so it's impossible for Kanon to be Beatrice on the basis of Dlanor's argument. However, there's no proof that Beatrice and the culprit are the same person, so Kanon could still be the culprit.

On the other hand, Beatrice insisted that the sin wasn't against her and that she didn't bear a grudge against Battler for it. There is a possibility that she's actually a close friend of the person who was sinned against, and learned of the sin from that person.

Due to your sin, a great many humans on this island die.
It is impossible for Kanon to be aware of Battler's Sin.