The latter, on reflection. My suspicion is that she had, initially, thought that nothing they had planned would be harmful to Natsuki, and that she did a runner after finding evidence otherwise... but I'm aware that I can often be overgenerous.
Ja, -n
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"I'm terribly sorry, but I have to kill you quite horribly now."
Ja, -n
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"I'm terribly sorry, but I have to kill you quite horribly now."