Flower, Sun, and Rain is an adventure game where players take the role of main protagonist Sumio Mondo. As Mondo, the player navigates the environments around the "Flower, Sun, and Rain" hotel on the island resort of Lospass. The game is split into chapters that take place across eighteen days. While he has a main goal, "Obstacle" events will block his path, prompting him to help people, solving problems and locating lost items. Each day after the initial opening segment begins with Mondo in his hotel room, and after that time Mondo is allowed to explore the environments within and surrounding "Flower, Sun, and Rain".