Inuyasha the Movie: Swords of an Honorable Ruler is a 2003 Japanese animated fantasy adventure film based on the Inuyasha manga series written and illustrated by Rumiko Takahashi. The film is directed by Toshiya Shinohara, written by Katsuyuki Sumisawa, and produced by Sunrise. It was released in Japan on December 20, 2003.
In the film, Inuyasha and Sesshomaru forcefully work together to seal So'unga, their father's third sword, when it is awakened from its sheath.
Swords of an Honorable Ruler is the third film of the Inuyasha series, following The Castle Beyond the Looking Glass and followed up by Fire on the Mystic Island.
Plot
Two centuries ago, the great dog-demon Tōga denies his elder son Sesshomaru's request for ownership of two of his swords, Tessaiga and So'unga. Afterwards, Tōga goes to a mansion guarded by an army of samurai where his human wife, Lady Izayoi, is giving birth. The army's leader, Takemaru of Setsuna, who is in love with Izayoi, attempts to kill her by stabbing her and setting the mansion ablaze. Tōga defeats the army, wounds Takemaru and enters the mansion, where he uses his third sword, Tenseiga, to revive Izayoi. Tōga allows her to flee the burning mansion with their newborn, whom he names