"Sisyphus at Peace" is a manga series that explores themes of existentialism, resilience, and the human condition through a blend of surrealism and grounded storytelling. The narrative centers on a protagonist who, after enduring a lifetime of relentless struggle and hardship, finds himself in a mysterious, tranquil afterlife. This afterlife is depicted as a serene, dreamlike landscape where time and purpose seem to have lost their meaning. The protagonist, initially disoriented by the absence of the ceaseless toil that defined his existence, begins to grapple with the unfamiliar concept of peace.

As the story unfolds, the protagonist encounters other individuals who share similar histories of unending struggle. These characters, each bearing the weight of their pasts, form a loose community within this ethereal realm. Their interactions reveal fragmented memories of their previous lives, highlighting the cyclical nature of their struggles and the universal human desire for meaning. The narrative delves into their attempts to reconcile their pasts with the newfound tranquility, exploring questions of identity, purpose, and the possibility of redemption.

The manga employs a nonlinear structure, weaving together flashbacks of the characters' lives with their present experiences in the afterlife. These flashbacks depict moments of perseverance, despair, and fleeting joy, offering insight into the forces that shaped them. The protagonist, in particular, is haunted by memories of a seemingly futile task that consumed his life, drawing parallels to the myth of Sisyphus. However, unlike the myth, the story shifts focus from the futility of labor to the search for inner peace and acceptance.

Throughout the series, the afterlife setting evolves, reflecting the characters' emotional and psychological states. The serene environment occasionally gives way to moments of tension and unease, mirroring their struggles to adapt to a life devoid of struggle. The narrative builds toward a contemplative climax, where the protagonist and others confront the possibility of moving beyond their pasts and embracing the present. The ending leaves room for interpretation, emphasizing the ongoing nature of their journeys and the complexity of finding peace after a lifetime of strife.