the Makihara guess comes from here

however, I think it's Hisaki Furukawa's animation. It's the avan of the first episode so if there were ever a reason to give someone a separate credit, which Furukawa has, it would be for this. Furukawa also has 絵コンテ協力 so again if he were to assist with a storyboard, it would be for the avan and not somewhere randomly in the episode

animation-wise I would also say it looks more like his work tbh