Sakura Ai has always loved sunflowers, as they appear like the sun, which incidentally also was the name of her first crush, Taiyou, in the 3rd grade. From since then, Ai has never had another love and has also become quite introverted, but after meeting a guy with the same name, something’s will begin to change… Her 15th summer, finally love will begin~ Ai is a High-School student in the first year and she loves sunflowers. There is a boy calles Taiyou (sun) and when they were in the elememtary school he called her O-baa-chan, which means grandma. One day, they came closer, What will happen to them?