At the start of the school year, Aoba and Mizuki enter Seishu High School, where Mizuki quickly becomes popular with girls, to Senda's annoyance. Aoba joins the baseball team as a pitcher, which pleases Akaishi and Maeno as the rest of the team will try hard to not lose to a girl. When Mizuki and Aoba reminisce about Wakaba, he tells her that Aoba is the one he loves. Mizuki belatedly recognizes Ko as Wakaba's boyfriend and wonders whether he throws a 160 km/h fastball yet. Momiji asks Aoba if she finds Mizuki attractive but she does not answer, and later Momiji remembers Ko and Wakaba playing with her and silently apologies to Wakaba. Several girls ask Mizuki out. He turns them down, claiming to be in love with Aoba, and tells some irate boys that the rumor that Aoba and Ko are going out is false. At practice, Ko tells Akaishi that Aoba is hiding a twisted ankle no one had noticed, and Aoba retaliates by revealing Ko is hiding a stiff left arm. As Mizuki helps Aoba walk home, he tells her he is serious about her.
星秀学園高等部に進学をした青葉。朝見水輝も星秀学園に入学をしていて、女生徒の注目の的となっていた。水輝は青葉の従姉妹ということもあり、月島家に居候をすることに。青葉と一つ屋根の下で暮らすことを気にする光や東たち。青葉は野球部に入部する。そんな中、水輝に告白された青葉は彼を意識するようになるが…。
세이슈학원 고등부에 진학한 아오바는 야구부에 입부한다. 여자이면서 같은 학년 중에서 가장 실력이 뛰어나지만, 공식전에는 출전하지 못한다. 한편, 세이슈학원에 입학하게 된 미즈키는 아오바의 친척이라는 이유로 츠키시마가에서 지내게 된다. 그 사실을 알게 된 코우와 아즈마는 왠지 모르게 신경이 쓰이는데...
