Kasugaigarasu is a Kasugai crow in Kimetsu no Yaiba, one of the messenger crows that assist Demon Slayer Corps members by delivering orders, updates, and mission details. Unlike human characters, Kasugai crows serve as important support companions rather than frontline fighters. They help keep the organization connected and coordinated during operations against demons. Kasugaigarasu’s role reflects the series’ emphasis on teamwork, communication, and the wider network that supports the Demon Slayer Corps.