Seventeen-year-old Haru saves a cat from being hit by a truck on her way to school, not realizing that the cat is actually the prince of the Cat Kingdom. In gratitude, she is invited to visit the Cat Kingdom. Haru, a bit confused, embarks on this unexpected journey, encountering many strange cats and bizarre events along the way. The king of the Cat Kingdom even proposes to her, asking her to marry the prince and become a queen. As Haru starts to enjoy the idea of living as a cat, will she stay in the Cat Kingdom or return to the real world?