In Shadows of Summer, Izumi and his girlfriend Sophia finally get a break after a long school year, ready to enjoy their summer together. When Izumi receives an unexpected invitation from his estranged father, Kuroda, to spend the season at his coastal countryside home, he reluctantly agrees that Sophia comes along. At first, it's just a quiet escape by the sea. But as the days drift by, Sophia and Kuroda begin to form a bond that stretches beyond the bounds of a typical family connection. While Izumi embraces the slow pace of summer, unaware and carefree, something far more complicated is unfolding beneath the surface right under his nose.