
Quick answer — Fumiaki Usui worked on Poco's Udon World (Assistant Director), Boarding School Juliet (Assistant Director), Yamada and the Seven Witches (Assistant Director) and 4 more anime.
Fumiaki Usui worked on Poco's Udon World (Assistant Director), Boarding School Juliet (Assistant Director), Yamada and the Seven Witches (Assistant Director), Yamada and the Seven Witches (OVA) (Assistant Director), Magical Sempai (Director), LOVE and LIES (Assistant Director), LOVE and LIES OVA (Assistant Director).