Quick answer — Katsuhiro Kumagai worked on Gabriel Dropout OVA (Chief Animation Director), Gabriel DropOut (Character Design), Diary of Our Days at the Breakwater (Character Design) and 3 more anime.
Katsuhiro Kumagai worked on Gabriel Dropout OVA (Chief Animation Director), Gabriel DropOut (Character Design), Diary of Our Days at the Breakwater (Character Design), Joshiraku OVA (Animation Director), The Helpful Fox Senko-san (Chief Animation Director), The Shiunji Family Children (Chief Animation Director).
