"Cat + Gamer" centers on Riko, a dedicated office worker whose life revolves around video games. Her routine-driven existence takes an unexpected turn when she adopts a stray kitten she names Musubi. Despite having no prior experience with pets, Riko approaches cat care with the same methodical and analytical mindset she applies to gaming. She meticulously researches feline behavior, nutrition, and training, treating the process like a new game with its own set of rules and challenges.

The narrative explores Riko’s gradual adaptation to life with Musubi, highlighting her growing affection for the kitten and her efforts to balance her gaming hobby with her new responsibilities. Musubi’s playful and sometimes mischievous behavior often mirrors the unpredictability of in-game challenges, creating humorous and heartwarming moments. Riko’s colleagues occasionally provide support and advice, adding a layer of workplace camaraderie to the story.

The manga emphasizes the parallels between Riko’s gaming strategies and her approach to cat care, blending her logical problem-solving skills with the emotional rewards of nurturing a living being. As the story progresses, Riko’s relationship with Musubi deepens, showcasing her personal growth and the joy she finds in this new chapter of her life. The series balances lighthearted humor with a thoughtful exploration of responsibility, companionship, and the unexpected ways life can change.