TV-Series
Description
Kaoru Kawahira is introduced as a cousin of the protagonist, Keita Kawahira. He stands as a foil to Keita, possessing a more restrained, respectful, and well-mannered demeanor while remaining equally kind-hearted. As a member of the Kawahira family, which possesses the spiritual power to tame Inukami, Kaoru demonstrates remarkable ability by forming a contract with a pack of ten Inukami, a feat reserved for those with very strong spiritual powers. He is a young man of around sixteen years of age who carries himself with an athletic grace and a composed, respectable air that earns him high regard from others.

In terms of abilities, Kaoru is both athletic and a powerful magic-user. His signature combat technique involves commanding the wind to deliver destructive energy blasts, which he channels through a conductor's baton, using its movements as a medium for his spells. His magical strength and composed nature make him an effective leader and fighter in the ongoing struggle against troublesome spirits and the Jarei.

Kaoru's role in the story is significant as both a rival and an ally to Keita. While Keita struggles to manage a single, unruly Inukami named Yoko, Kaoru's successful command of a full pack highlights the disparity in their reputations within the spirit-taming world. He serves as a source of support for Keita, at one point sending his own Inukami, Nadeshiko, to assist in training Yoko. Kaoru's relationships with his contracted spirits form a core part of his character development. All ten of his Inukami care for him deeply, and he reciprocates their loyalty and affection. Among them, his bond with Nadeshiko is the strongest and is implied to be romantic in nature.

Significant character development occurs within the anime series, where Kaoru's background takes a darker turn. It is revealed that he is living under a terrible curse that has placed him in a false, decaying body that is near death. He has kept this secret from nearly everyone, sharing it only with Nadeshiko, to whom he confessed his love. His past involves being raised by an evil magician who survives by feeding on the despair of the people around him, and this villain is responsible for stealing everything from Kaoru. This tragic backstory culminates in a moment of self-sacrifice when Kaoru gives his own life to save Nadeshiko.