
Quick answer — Kenji Saitou worked on Trinity Seven: Heavens Library & Crimson Lord (Original Creator), Trinity Seven: Eternal Library & Alchemic Girl (Original Creator), Trinity Seven: Nanatsu no Taizai to Nana Madoushi (Original Creator) and 1 more anime.
Kenji Saitou worked on Trinity Seven: Heavens Library & Crimson Lord (Original Creator), Trinity Seven: Eternal Library & Alchemic Girl (Original Creator), Trinity Seven: Nanatsu no Taizai to Nana Madoushi (Original Creator), TRINITY SEVEN (Original Creator).