When you’re 16, you’re a kid. When you’re 26, you’re an adult. In between, you’re a childish adult. Aki, Kanoko, Shouko, and Shiori are close friends in college that are all 20-years-old.

In the middle of celebrating Shouko’s birthday, she proposes that they all go to the beach. Even though it’s cold, they still drunkenly play in the water and laugh together. This is the story of four women who are not-quite-adults, and not-quite-children, and their stories of love.