SFLSNZYN said:
this, https://sakugabooru.com/post/show/39017 & https://sakugabooru.com/post/show/39015 all confirmed by boya liang on weibo. according to her, all 3 of those animators are main force of the show, with igarashi-san & fukuda-san focusing on dance scenes and ghibli-born ohta-san focusing on ordinary movements. besides, takehana kengo-san(竹花健吾) would animate both sorts of scenes and shingo takenaka-san would do scenes designated by director & ed animation