Tatsuya Uesugi is the twin brother of Kazuya, pitcher of the Meisei High School baseball team. Irresolute about his feelings towards baseball, his next door neighbor, and his brother; Tatsuya ends up joining his school's boxing club. From the sidelines, he quietly watches the ascension of Kazuya.

Tatsuya and Minami meet Akio Nitta, an ace batter who thought of Kazuya as his rival. Nitta sees great potential in Tatsuya and expects to face him on the road to the national high school baseball tournament.

Due to sickness, the coach position of the Meisei High School baseball team is handed to Eijiro Kashiwaba. He is a ruthless man who forces the team to enter a Spartan training procedure. Tatsuya and Minami slowly discover stories about his past and wonder what his true intentions are.

This fourth movie takes place a couple of years after the series. Minami and Tatsuya are both in college now. Different colleges, I might add. Tatsuya has quit playing baseball. Nitta is still pursuing Minami. And Tatsuya has a mysterious girl named Kaori at his college that seems to like him. So, how will all this affect the relationship between Minami and Tatsuya?

Trying to find his own game of baseball, and not that of his brothers, Tatsuya moves to America and pitches for a poor, struggling minor league baseball team called the Emeralds. Meanwhile, Minami is still in Japan, trying to find her own path after quitting gymnastics. Inspired by a photograph of her final performance, she becomes the photographers assistant.