For 16-year-old Kaito, summer is a time of change. After a painful experience in the past, he's struggled to connect with others. One evening, while helping his grandmother tend to her sunflower garden, he meets a free-spirited girl named Luna. As they work together, Kaito finds himself drawn to Luna's zest for life, and she encourages him to confront his fears and open up to others. As the sunflowers bloom in the night, Kaito begins to heal and grow, learning to trust others and find his place in the world.