Yumizu Kinamari appears in Episode 10 of Hakushon Daimaō 2020 as the owner of a pet bulldog named Burgon. Seeking help for Burgon's spoiled behavior, he consults professional dog trainer Inugami Milano at a training center. The narrative directly attributes Burgon's behavioral issues to Yumizu's actions and approach to pet ownership.

His involvement centers on a storyline where Burgon's panic triggers a dangerous cliff-edge incident. Though not directly participating in the rescue, Yumizu's responsibility for Burgon's condition defines his role in both the episode's conflict and its resolution.