InuYasha Episode 158: Stampede of the Countless Demon Rats!
Episode 158 of 167 of InuYasha, aired July 5, 2004, 24 minutes. Available with English subtitles and dub where released.
Episode summary
Naraku lets Hakudoshi employ a new method to bring Kikyo out of hiding--a tidal wave of endless demon rodents. Also, Kohaku finds himself in a dilemma.