
Quick answer — Chiharu Koyama worked on Toilet-Bound Hanako-kun Season 2 Part 2 (Prop Design), Toilet-bound Hanako-kun Season 2 (Prop Design).
Chiharu Koyama worked on Toilet-Bound Hanako-kun Season 2 Part 2 (Prop Design), Toilet-bound Hanako-kun Season 2 (Prop Design).