Tatamura Hikaru, the son of the manager of a small-town sporting goods store. Shu Duocun's family and Yuedao's family are family friends. Light has a particularly good relationship with Ruoye, the second daughter of Yuedao's family, but it is an incompatible pair with Qingye, the third daughter. In the summer of the fifth grade of primary school, Ruoye died unexpectedly, which caused a great blow to people around him.

Xiaoguang didn't join the baseball department in junior high school. In high school, Guang joined the Baseball Department with his friends from primary school, Akashi and Chinese and Western. But by this time, the Baseball Department has been occupied by new baseball students from other schools, and it has become a tool for the principal's agent and gate supervision. Xiaoguang and them have been incorporated into the Second Army, also known as the Fertilizer Group.

In order to realize Ruoye's last dream before his death, Xiaoguang started from the fertilizer group, defeated the overseas student corps supervised by the gate, and marched step by step towards the dream of Koshien.

A year later, Qingye joined the Star Show. That year, Xiaoguang was a sophomore and Qingye was a freshman, and youth left the most brilliant mark here.

The legendary four-leaf clover has such a beautiful and soft poetic meaning. One leaf is prayer, the other is hope, the third is love, and the four-leaf clover will gently tell you that happiness is around you. Mitsuru Adachi's classic works in the mature period will bring four leaves of happiness, the story of youth begins, and childhood friends are four sisters! ! !