A single man named Mami Sanzaki suddenly finds himself as the guardian of his young niece, Kotone, following the death of his sister, who was a single mother. Committed to raising the girl, Mami struggles to balance his job with the overwhelming demands of housework and childcare. Exhausted and desperate for help, he decides to hire a babysitter through an agency. However, when the requested help arrives, it is not a human caregiver but a cat named Gomashio.

The story is a gentle comedy that revolves around the unconventional household formed by Mami, Kotone, and their feline assistant. Despite being a cat, Gomashio proves to be surprisingly competent, easing the burdens of daily life and providing comfort to the grieving child, who clearly adores both her uncle and the cat. The narrative focuses on the found family dynamic and the humorous yet heartfelt situations that arise from relying on a cat for help with raising a toddler.

The manga is a complete story contained in a single volume. A notable narrative arc includes Mami’s initial struggle to adapt to his new life as a single guardian, followed by the gradual development of a warm and stable home environment thanks to Gomashio’s unique brand of support. The story highlights the character growth of Mami, who is determined to be there for his niece, and the healing process for Kotone, who has lost her mother.