The best episode directed by Reiji Nagazono is "Insignia of an Ancient Castle", rated 8/10 from 2 user votes. It was "written by Sadayuki Murai". "Insignia of an Ancient Castle" aired on 3/9/2023 and is rated 0.5 point(s) higher than their second highest rated, "Conflict at the Snow Sea".
Just before the start of the war between Atland and Valghia, Kaina and his friends race to get proof of a great tree that can save everyone, including their enemies.
Director: Reiji Nagazono
Writer: Sadayuki Murai
The Valghians capture Ririha so they can strongarm the Atlandians into surrendering. The Atlandian soldiers engage in the battle to rescue Ririha and Kaina, but aren't successful. Ririha manages to free Kaina while she remains in captivity.
Director: Reiji Nagazono
Writer: Sadayuki Murai
Once the Valghian admiral receives Atland's message that they will not surrender, he decides to leave Ririha outside to freeze to death. Luckily, Kaina and Yaona come to her rescue, but now they must figure out a way to escape and return to Atland.
Director: Reiji Nagazono
Writer: Sadayuki Murai
Drunk on power, the Admiral continues to operate the Builder and is determined to kill the King. Ririha tries to save her father, which results in making herself the Admiral's target. Will Kaina make it in time to save Ririha?
Director: Reiji Nagazono
Writer: Sadayuki Murai