When Sora Kashiwagi, a high school student accustomed to strange gifts from his globe-trotting father, anticipates another nightmare-inducing present from Egypt, he is surprised to unwrap Mii-kun—a small, adorable mummy. Initially cautious, Sora discovers Mii-kun's harmless nature, a fragile being seeking affection. As they navigate their quirky daily routines, the duo encounters individuals with unconventional pets, deepening their connection. Despite the challenges of pet ownership, Sora is determined to nurture the endearing Mii-kun.