Episode 24

Enter Sango, the Demon Exterminator is the twenty-fourth episode of the InuYasha anime. It first aired in Japan on April 23, 2001.

Plot
A band of demon exterminators head to a castle to defeat a demon. After they defeat the demon, Kohaku (A son of one of the exterminators) seemingly goes insane and kills the rest of the exterminators and is defeated by his sister, Sango. Because of her weakened state, she is easily persuaded by the prince of the castle that the one responsible for the tragic event is Inuyasha and gives her a jewel shard. She goes off, vowing revenge.

Trivia

 * In the manga version, this episode doesn't happen till after the chapters of the "Fateful Night in Togenkyo" episodes.