On one summer day, Wakaba leaves for camp after making a promise to Ko. A few days later, Ko happens to turn on the television, and a high school baseball game is on. During the exchange, a news report comes on, and Ko can't believe what he hears.

Wakaba asks Aoba what kind of boys she likes, Aoba says, "One who can throw a 100 mph fastball." Wakaba says that Ko may one day be able to throw that fast. Ko and Nakanishi's team faces Aoba's pitching in a sandlot baseball game. Aoba wins, but...

Ko, Akaishi and Nakanishi are starting high school, but under the new coach, only a few players make varsity. So Ko and the others join the Portables, the JV team who use a portable for a clubhouse. At the Jr. High, Aoba is the team’s new captain.

Ko and Senda visit the junior high to watch the scrimmage game. Aoba is pitching, and she’s so in control she purposely lets the batters get a few hits.

The Portables triumph over varsity, and Coach Daimon and the interim principal leave the school, along with some of Daimon's recruits. Azuma decides to stay at Seishu Gakuen High.

Midori asks Aoba to play on an all girls' school baseball team in an upcoming game. But Aoba feels like she should stay true to Seishu Gakuen's team and decline.

Aoba plays on Midori's team against a college powerhouse, but she is put in center field. The college team is strong on offense, and it looks like it could be a blowout. But then, Aoba takes the mound..

Ko's new neighbor Akane looks exactly like Wakaba, which brings back a flood of memories to Ko.

The anniversary of Wakaba's death is also the day of the summer festival. After visiting Wakaba's grave, Ko goes to the festival with Akane. Everyone notices how much she looks like Wakaba.

Ko and his friends ring in the New Year by visiting a shrine. But they find themselves chasing after a pickpocket that victimized Junpei and Ichiyo.

During practice, a ball batted by Azuma hits Aoba in the leg so hard that she is hospitalized. Aoba has to pull herself out of the women's baseball tryouts, and Azuma is wracked with guilt.

The Seishu Gakuen baseball team gets a day off before their training camp begins. This year's summer tournament is especially important for Azuma, Akaishi, Nakanishi and Senda, as it is their last chance to aim for Koshien.

Ko visits Akane in the hospital and finds out that she is to undergo an operation on the day of the tournament final. Ko tells Aoba, and they pray to Wakaba for a successful operation before heading into the final game.

In the bottom of the seventh inning, Ryuou Gakuin is down by one, and Mishima comes up to bat with two outs. Ko can afford to walk him?

Thanks to Ko, Seishu has earned a one-run lead in the twelfth inning, but pitching eleven innings is starting to take its toll on Ko.