Ami, a backpacker from Japan, starts working at high school student Jimmy's part-time job. The two spend the summer days working together, and the nights riding motorcycles and going to the movies. They start to develop feelings, but suddenly, Ami decides to return to Japan and the relationship ends, unresolved. 18 years later, Jimmy visits his parents' home to find a postcard he received from Ami when she first got back to Japan. Wondering what he missed out on as a teenager, he takes his first solo trip to Japan as an adult to find Ami again.