Kumada is a salaryman who has spent his entire life building an ironclad system of risk avoidance. From childhood he has lived by proverbs such as "Better safe than sorry" and "A wise man keeps away from danger," meticulously hedging against every conceivable misfortune. He has created a fortress of manuals and routines that allow him to enjoy a quiet, controlled single life in his apartment. That carefully managed existence is shattered when a massive, realistic bear suddenly appears in his home. The bear does not attack; instead, it inexplicably begins to cook, clean, shop online, and perform all manner of household chores. Kumada's greatest risk has taken the form of a creature that is both terrifying and inexplicably domestic. The story follows their strange cohabitation, with Kumada's hypervigilant mind constantly struggling to analyze and contain a threat that defies all his preparation. Over time, the bear's gentle yet inscrutable presence forces Kumada to confront the limits of his risk-averse worldview and gradually adapt to the chaos of living with an uncontrollable housemate. Later narrative threads introduce elements such as a Russian bear hunter, further pushing the premise into unpredictable comedic territory while maintaining a heartwarming undercurrent as the two unlikely roommates learn to coexist.