That depends on how you translate it. As it is some people speculate it's Kayo forgetting her family was dead. In my opinion, this makes no sense in the context of the song, and I think it would be better translated as "It should not be forgotten (or even) If it's not forgotten", referring to the fact that they put up Kayo's head so people wouldn't forget her crime. But my translation isn't the one that was agreed upon, so take it with some salt.

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