It’s unclear whether the spell Maizuru put on Izutsumi is actually lethal. This World Guide chapter reveals that the spell is called “Ninpo: Babysitter” which suggests a much less ghoulish purpose, and that she in fact developed the spell for keeping track of Shuro when he was a child.
But even then, it simply ended up traumatizing him.
This chapter also features Izu, the day she was brought into the Nakamoto family as a retainer.
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