Captain Yajima serves as the leader of a government agency team dedicated to the eradication of phantom cats, entities that can take human form. His role places him in direct operational proximity to the private-sector Kagura Total Security company, which is also in the phantom capture business. Yajima is characterized by an alpha male personality, projecting an image of a strong, assertive, and commanding presence befitting his position as a field leader.

From his perspective, the methods employed by the Kagura firm are seen as chaotic and profit-driven, making them well-meaning nuisances. However, Yajima is pragmatic enough to recognize that their unorthodox and destructive approach can be a useful tool, particularly when dealing with larger, more significant threats that his team is also facing. This creates a complex working relationship where the government agents and the Kagura group are often at odds but find themselves forced to cooperate against common, more dangerous enemies.

A key relationship for Captain Yajima is with his partner, Ayumi Narusawa, a statuesque action heroine who works alongside him as part of the same government unit. While his primary relationship is professional, his dynamic with Narusawa forms the core of his team’s effectiveness. In the broader context of the story, Yajima’s motivations are rooted in the mission to control the phantom cat threat. He and his team are presented as a middle ground, operating with more authority than the freelance Kagura group but with more restraint than the military. The military’s ham-fisted and indiscriminate methods of dealing with phantoms are portrayed as causing even greater destruction than the chaotic tactics of Kagura, and Yajima’s team, along with Kagura, risks being steamrolled by this more aggressive force. No information is available regarding his personal background, his development throughout the narrative, or any specific notable supernatural or combat abilities beyond his role as a field leader.