"Iincho Blog" is a manga series that revolves around the life of a high school class representative, or "iincho," who secretly maintains a blog documenting the daily lives and interactions of classmates. The protagonist, a diligent and observant student, uses the blog as an outlet to express thoughts and observations that remain unspoken in real life. The blog becomes a focal point for uncovering hidden dynamics, personal struggles, and unexpected relationships within the class.

The narrative explores the contrast between the protagonist's public persona as a responsible and composed class leader and the candid, often critical voice that emerges in the blog. As the blog gains traction among classmates, its anonymity becomes a source of tension. Students begin to speculate about the blogger's identity, leading to a series of misunderstandings and conflicts. The protagonist must navigate the ethical dilemma of maintaining the blog's secrecy while grappling with the consequences of its revelations.

Key characters include the protagonist, whose internal monologues and blog entries drive the story, and a diverse cast of classmates who represent various archetypes and personalities. Among them are the popular student whose insecurities are exposed, the quiet loner who finds solace in the blog's honesty, and the overachiever whose facade of perfection begins to crack. The interactions between these characters are shaped by the blog's influence, as it inadvertently brings their hidden truths to light.

The plot progresses through a series of episodic arcs, each focusing on different classmates and their reactions to the blog's content. Themes of identity, privacy, and the impact of social media on interpersonal relationships are central to the story. The manga balances moments of humor and drama, often highlighting the gap between public perception and private reality. As the protagonist's dual life becomes increasingly difficult to sustain, the story builds toward a climax that forces a confrontation with the consequences of their actions. The resolution underscores the complexities of human connection and the power of honesty in a world shaped by digital communication.