"Kamen Teacher" is a manga series that centers around Goto, a former delinquent turned teacher, who adopts a unique approach to reforming troubled students. After a violent incident in his youth, Goto is given a second chance by the principal of Shinyo Academy, who tasks him with addressing the school's rampant delinquency. To maintain anonymity and authority, Goto wears a mask and adopts the persona of "Kamen Teacher," a mysterious figure who enforces discipline through unconventional and often extreme methods.

The narrative explores Goto's interactions with various students, each grappling with personal issues such as bullying, family dysfunction, and societal pressures. Goto's methods, which blend physical confrontation with psychological insight, aim to break through the students' defenses and guide them toward self-improvement. His approach is controversial, often clashing with traditional educational norms and drawing scrutiny from colleagues and administrators. Despite this, Goto remains committed to his mission, driven by a desire to prevent others from following the same destructive path he once did.

Key characters include the principal, who serves as Goto's mentor and supporter, and several students whose arcs intertwine with Goto's efforts. These students, such as the rebellious Akira and the withdrawn Yuki, represent different facets of adolescent struggle, providing a diverse backdrop for Goto's interventions. The series delves into themes of redemption, the complexities of human behavior, and the challenges of reforming a broken system.

The plot progresses through episodic arcs, each focusing on a specific student or issue, while maintaining an overarching narrative about Goto's personal growth and the evolving dynamics within Shinyo Academy. The tone balances action and drama, with moments of introspection that highlight the emotional stakes for both Goto and the students. Through its exploration of moral ambiguity and the impact of mentorship, "Kamen Teacher" offers a compelling examination of the educational system and the potential for change within individuals.