"Hokago Hokenshitsu" is a supernatural manga series that revolves around the mysterious activities occurring in a high school infirmary after hours. The story centers on Kyousuke Shinozuka, a reserved and observant student who discovers that the school nurse, Sakurako Fujisaki, is not an ordinary caregiver. Fujisaki possesses the ability to communicate with supernatural entities and uses the infirmary as a space to assist troubled spirits and resolve their lingering issues. These spirits often manifest as students or other individuals connected to the school, each with their own unresolved emotions or unfinished business.

The narrative unfolds episodically, with each chapter focusing on a different spirit or supernatural occurrence. Kyousuke becomes an unwilling participant in Fujisaki's work, often drawn into her investigations due to his heightened sensitivity to the supernatural. Despite his initial reluctance, he gradually becomes more involved, serving as a grounded counterpoint to Fujisaki's enigmatic and sometimes reckless approach. The interactions between the two characters reveal their contrasting personalities, with Fujisaki's calm and detached demeanor juxtaposed against Kyousuke's cautious and empathetic nature.

As the series progresses, recurring themes of loss, regret, and the human condition emerge through the stories of the spirits. The spirits' struggles often reflect broader emotional or societal issues, such as unfulfilled dreams, unresolved relationships, or the consequences of societal pressures. Fujisaki's methods of helping these spirits vary, ranging from gentle guidance to more direct interventions, but her ultimate goal is to provide closure and allow them to move on.

The setting of the infirmary serves as a liminal space, bridging the mundane world of the school and the supernatural realm. This duality is reinforced by the contrast between the sterile, clinical environment of the infirmary and the emotional, often chaotic experiences of the spirits. The series maintains a balance between eerie, suspenseful moments and poignant, reflective scenes, creating a tone that is both unsettling and introspective.

Through its episodic structure and focus on character-driven stories, "Hokago Hokenshitsu" explores the complexities of human emotions and the lingering impact of unresolved issues. The dynamic between Kyousuke and Fujisaki, along with the diverse array of spirits they encounter, forms the core of the narrative, offering a blend of supernatural intrigue and emotional depth.