Quick answer — Akira Iwanaga worked on Kingdom Season 2 (Director), Letter Bee Reverse (Director), The Faraway Paladin: The Lord of Rust Mountains (Director) and 8 more anime.
Akira Iwanaga worked on Kingdom Season 2 (Director), Letter Bee Reverse (Director), The Faraway Paladin: The Lord of Rust Mountains (Director), Letter Bee (Director), The Morose Mononokean (Director), Arifureta - From Commonplace to World's Strongest: The Miraculous Meeting and the Phantasmagorical Adventure (Director), Arifureta: From Commonplace to World's Strongest Season 2 (Director), Arifureta: From Commonplace to World's Strongest Season 3 (Director) and 3 more.