
Quick answer — Wataru Osakabe worked on Doukyuusei -Classmates- (Sub Character Design), Black Butler: Public School Arc (Design Works), After the Rain (Title Logo Design) and 2 more anime.
Wataru Osakabe worked on Doukyuusei -Classmates- (Sub Character Design), Black Butler: Public School Arc (Design Works), After the Rain (Title Logo Design), BNA (2D Works), Akuma Kun (Magic Circle Design).