
Quick answer — Mitsuhisa Ishikawa worked on xxxHOLiC◆Kei (Planning), HAIKYU!!: VS Failing Marks (Production), Blood+ (Executive Producer) and 15 more anime.
Mitsuhisa Ishikawa worked on xxxHOLiC◆Kei (Planning), HAIKYU!!: VS Failing Marks (Production), Blood+ (Executive Producer), xxxHOLiC (Planning), Broken Blade 4 (Planning), Broken Blade 5 (Planning), Broken Blade 3 (Planning), Broken Blade 2 (Planning) and 10 more.