Shougi Board, and Underground Ruins

Touya learns there are demi-human races, such as elves and beast-men and helps a lost fox-girl named Arma find her older sister, another fox-girl named Olga. Touya buys a magicians coat that protects magicians against magic they can use but makes them weaker against magic they can’t use, but since Touya can use every type of magic the coat protects him from all magical attacks. Touya visits the Duke and teaches him how to play Shogi. Touya and the girls accept a quest to destroy a Dullahan near the ruins of the old capital city. With the Dullahan defeated, Touya uses a Null locating spell and finds an item of magical value hidden in a secret dungeon. After accidentally activating the item it turns out to be the energy source for an artificial glass beast that can repair any damage done to it but they manage to destroy the energy source. The Duke suspects the beast may have been the reason the old capital was abandoned and asks Touya to aid an investigation into why the old capital city was destroyed. In the middle of the investigation the Duke learns his brother, the King, has been poisoned and is gravely ill.

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S01E04 - Engagement, and an Uninvited Visitor