
Quick answer — Nao Akinari worked on Trinity Seven: Heavens Library & Crimson Lord (Original Character Design), Trinity Seven: Eternal Library & Alchemic Girl (Original Character Design), Trinity Seven: Nanatsu no Taizai to Nana Madoushi (Original Character Design) and 3 more anime.
Nao Akinari worked on Trinity Seven: Heavens Library & Crimson Lord (Original Character Design), Trinity Seven: Eternal Library & Alchemic Girl (Original Character Design), Trinity Seven: Nanatsu no Taizai to Nana Madoushi (Original Character Design), TRINITY SEVEN (Original Character Design), I'm Standing on a Million Lives Season 2 (Original Character Design), I'm Standing on a Million Lives (Original Character Design).