Sakura Ai always loved sunflowers, as they look like the sun, which, by the way, was also named after her first love, Thai, in the third grade. Since then, the AI ​​has never had another love, and she also became a rather introvert, but after meeting with a guy with the same name, something will start changing ... Her fifteenth summer will finally begged Love ~ AI is a high school student in the first year And loves sunflowers. There is a guy named Taiyou (Sun), and when they were in elementary school, he called her O-Baa-Chan, which means grandmother. Once they approached, what will happen to them?