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I gotta believe that this part was done with pre-recorded dialogue. The mouth movements match well.
FierceAlchemist said:
I gotta believe that this part was done with pre-recorded dialogue. The mouth movements match well.
youre correct! the director himself recorded a video of himself singing the haiku which cedric herole and naomi kaneda used as a reference to animate this scene. it was handled jointly(in that order)

source: https://febri.jp/topics/ciderkotoba2/