Yuna, a wealthy but reclusive 15-year-old who obsessively played the virtual reality game World Fantasy Online for nearly a year, is gifted a bear costume by the game's developers. While initially hesitant about wearing the outfit, she discovers that it bestows her character with extraordinary abilities. However, after donning the bear equipment, she finds herself trapped in a new in-game world and unable to exit. Yuna embarks on a journey to explore the unfamiliar environment but is confronted by wild wolves. She rescues a fellow player named Fina, who leads her to the city of Crimonia. Yuna's bizarre bear garb draws unwarranted attention everywhere she goes, and combined with her newfound strength, she gains notoriety as the "Bloody Bear." Undeterred by the unexpected turn of events, Yuna embraces her role as an adventurer and relishes the opportunity to immerse herself fully in this alternate world.