"Kōkō Kyūji Zawa-san" is a comedic manga series centered around the daily life of Zawa-san, a high school janitor whose unassuming appearance and calm demeanor belie his extraordinary ability to resolve bizarre and chaotic situations at his school. The narrative unfolds in a high school setting, where Zawa-san interacts with a colorful cast of students, teachers, and staff, each contributing to the series' humor and episodic structure. Despite his low-profile role, Zawa-san often becomes the unexpected hero, using his resourcefulness, quick thinking, and occasionally absurd methods to restore order.

The plot is driven by a series of self-contained, humorous incidents that range from mundane school mishaps to surreal and over-the-top scenarios. Zawa-san's interventions are often unconventional, blending practicality with a touch of the absurd, which adds to the series' comedic appeal. The students and faculty, while often the source of the chaos, also serve as foils to Zawa-san's calm and collected nature, creating a dynamic interplay of personalities.

Key characters include Zawa-san himself, whose deadpan reactions and understated competence make him a memorable protagonist. The students, such as the overly enthusiastic class president, the mischievous troublemakers, and the eccentric club members, provide a steady stream of comedic fodder. The faculty, including the bumbling principal and the overly dramatic teachers, further amplify the series' humor through their exaggerated personalities and interactions with Zawa-san.

The manga's episodic format allows for a wide variety of comedic situations, ensuring that each chapter offers a fresh and entertaining scenario. The humor often arises from the contrast between Zawa-san's unassuming role as a janitor and his ability to effortlessly resolve even the most outlandish problems. This juxtaposition, combined with the series' lighthearted tone and relatable school setting, makes "Kōkō Kyūji Zawa-san" a consistently engaging and enjoyable read.