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"um, I don't know if it Kaguya or Eiren, but the Watatsuki Sisters (surprisingly) look up to them, think of themselves as her successor and i believe understudy. Eirin also wrote a letter to the sisters in SSiB, and all four (the sisters, Eirin and Kaguya) seem to be on good terms. Source is Silent Sinner in Blue" - Rumia, Captain of the Seirensen Vanguard

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