After a long unrequited love, Mahiru and Amane finally begin dating, and the inexperienced two stumble through their new relationship while steadily growing closer to each other. Although initially annoyed by the commotion surrounding Mahiru and him at school, Amane slowly changes and becomes more upfront and confident. Seeing this, Mahiru can't help but feel slightly uneasy...but it's time for a vacation and an unforgettable summer awaits them!