Kako (Fumi Nikaido) is a female high school student. She lives at a restaurant run by her family in Kitashinagawa, Tokyo. Unexpectedly, Kako’s aunt, Mikiko (Kyoko Koizumi), suddenly appears. Kako thought her aunt died 18 years ago. Her whole family is embarrassed by Mikiko’s appearance due to a past incident caused by Mikiko. Kako is also irritated when Mikiko lives in her room. They spend the summer together.

The story of two animals and their adventures. Milo, the cat, and Otis, the dog, are two animals who grew up together on the same farm. One day, the two are separated and begin a journey to find each other. The adventurous, and often perilous quest finds the two animals traveling across mountains, plains, and snow-covered lands searching for one another.