Chikomaru is an anthropomorphic hamster living alone in a dwelling with thin-strawed tatami flooring. This specific environment creates physical challenges and constraints that define his daily existence. His life unfolds as a recurring pattern of misfortune, leading to unfortunate incidents and accidents. These events frequently stem from the structural peculiarities of his home, especially the thin floor, which intensifies everyday mishaps and interactions.

Though solitary, Chikomaru navigates humorous yet subtly poignant situations arising from his circumstances. His experiences blend lighthearted misadventures and moments evoking sympathy, resulting directly from his persistent bad luck and vulnerability within his living space. The thin flooring contributes to his physical predicaments and also causes unintended consequences and noises affecting his downstairs neighbor, Kirin, establishing a dynamic of indirect interaction.

His background remains largely defined by his current living situation and ongoing struggles rather than a detailed personal history. Chikomaru's daily life consists of navigating minor crises and unexpected events tied to his environment and inherent clumsiness or misfortune. These ongoing challenges form the core of his narrative, portraying a continuous cycle of resilience amidst recurring adversity.

His existence centers on adapting to his challenging habitat while coping with the comedic yet melancholic outcomes of his persistent unluckiness. The character lacks significant evolution or broader narrative development beyond these established patterns of daily survival and minor incidents.