Watch Big Windup! Online

According to HMV, the DVD & Blu-ray volume 7 of Ookiku Furikabutte ~Natsu no Taikai Hen~ will include an unaired episode 12.5. Director Mizushima posted in his blog that the special was made because they couldn't put the original manga episodes happened between the episode 12 and 13 within the TV series.

Picking up where the original series left off, Ren Mihashi, the ace pitcher of the newly-formed Nishiura High School baseball team, and his teammates face the Sakitama High School team in the next round of the High School Baseball Invitational Tournament as they aim to play in the finals at legendary Hanshin Koushien Stadium. (Source: ANN)

One year before the beginning of the story. Kaguyama feels intimidated by Haruna’s presence on the baseball team since he feels that his position as the ace pitcher is threatened. Kaguyama wants to quit, but Haruna talks him out of it after telling Kaguyama about his own past. (Source: Wikipedia)

Ren Mihashi was the ace of his middle school's baseball team, but due to his poor pitching, they could never win. Constant losses eventually lead to his teammates bullying him and reached the point where his teammates no longer tried to win, causing Mihashi to graduate with little self-esteem. As a result, Mihashi decides to go to a high school in a different prefecture where he has no intention of playing baseball. Unfortunately, upon his arrival at Nishiura High, he is dragged into joining their new team as the starting pitcher. Although unwilling at first, Mihashi realizes that this is a place where he will be accepted for who he is; with help from the catcher Takaya Abe, he starts to have more confidence in his own abilities. Abe, seeing the potential in Mihashi, makes it a goal to help him become a pitcher worthy of being called an ace. [Written by MAL Rewrite]