I have a feeling that the person on whom Itachi first used Koto Amatsukami on was...noone other than Danzo!
Why?
He couldn't have used it on Sasuke during their last battle, so he must have used it on somebody before. Either him or Shisui used it on Danzo.
Now why Danzo?
Danzo was all set into protecting Konoha, doing everything to basically protect the village. Yes, you heard it right. Protecting Konoha, the same order that was supposed to be used on Sasuke.
Discuss.
Why?
He couldn't have used it on Sasuke during their last battle, so he must have used it on somebody before. Either him or Shisui used it on Danzo.
Now why Danzo?
Danzo was all set into protecting Konoha, doing everything to basically protect the village. Yes, you heard it right. Protecting Konoha, the same order that was supposed to be used on Sasuke.
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Discuss.