Because their parents are good friends, Tatamura Hikaru and Ruodao, who are cheerful and rough, have also become childhood friends, and they have a good agreement with Koshien as the stage. Unexpectedly, at the age of 1 1, Ruoye unfortunately fell into the water and died. In grief, the light silently buried the dream in my heart. As Ruoye's sister, Julia felt several times more sad than others. But as a baseball enthusiast since childhood, she chose to bite the bullet and commemorate her sister's death with practical actions. In a blink of an eye, light entered high school. In order to realize his dream, Guang joined the baseball team, only to be beaten into a useless "fat ball". The following year, Julia was admitted to the same school. With the encouragement of others, Guang and his teammates began strict training with the ultimate goal of "Koshien". As long as we don't give up baseball, we can be together forever. As long as we can get together and wait silently in the corner, the four-leaf clover representing happiness will be found one day.