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Iso is suspected NC on this OP for (I'm guessing) the background animation cut from 0:03 - 0:07

Koichi Arai and Norimoto Tokura are the only animators credited
Feels more like Iso was key animating the BG animation, but still ain't sure if he's a key animator of the OP
0:03-0:16 should all be iso, he has a unique artstyle where he draws shortened lines sort of like kishida does, and he doesnt color in the shading for clothing folds like arai or tokura do