
Quick answer — Katsuyuki Konishi worked on Prison School (Theme Song Performance), Prison School: Mad Wax (Theme Song Performance), Hetalia World Series (Theme Song Performance) and 2 more anime.
Katsuyuki Konishi worked on Prison School (Theme Song Performance), Prison School: Mad Wax (Theme Song Performance), Hetalia World Series (Theme Song Performance), Hetalia Axis Powers (Theme Song Performance), Monochrome Factor (Theme Song Performance).