Episode 73

Myoga tells InuYasha that in order to gain the power to break barriers, he needs to kill the gardien of the barrier of the demon bat tribe, who turns out to be a girl named Shiori, a half demon bat herself. Shiori has been offered by her human mother to her grandfather the demon bat leader in exchange for peace between the bats and the villager, but the demon bats didn't honor the truce. InuYasha and Shiori's mother go to the demon bats cave to retrieve Shiori, but InuYasha can't break the barrier, and would anyway refuse to kill another half-demon. To keep her mother from being killed, Shiori tells her to return home, leaving her daughter as gardien of the barrier for the bats. But the grandfather demon is suspicious, he fears Shiori's love for her mother might induce her to fail in her duty and return back to the village, and thus decides to kill all the villagers, including Shiori's mother, to eliminate the temptation.