
Quick answer — Keiichirou Saitou worked on Frieren: Beyond Journey’s End (Director), BOCCHI THE ROCK! (Director), BOCCHI THE ROCK! Recap Part 1 (Director) and 2 more anime.
Keiichirou Saitou worked on Frieren: Beyond Journey’s End (Director), BOCCHI THE ROCK! (Director), BOCCHI THE ROCK! Recap Part 1 (Director), BOCCHI THE ROCK! Recap Part 2 (Director), ACCA: 13-Territory Inspection Dept. - Regards (Director).