Na-i-sho is a 13 episode OAV series detailing the summer between the ~motto~ and the Dokkaan season. It is a bit more mature than the TV seasons, and looks to develop each of the five witches romantically. Hana is back to a baby, and the mahou shop is a bakery. (Source: ANN)

With the Inter-high over and as the end of summer approaches, Sakamichi trains intensely with Imaizumi Shunsuke and Naruko Shoukichi so he can carry on Team Sohoku’s spirit of supporting each other entrusted to him by Kinjou Shingo, Makishima Yusuke, and Tadokoro Jin, the third years who will be graduating before long. One day, Team Sohoku receives an invitation to the Kumamoto Fire Country Mountain Race, an invitational race for teams that performed well at the Inter-high, and their captain Kinjou decides their core Inter-high team will attend.

(Source: Crunchyroll)

Daigo, the son of renowned baseball player Gorou Shigeno, believes he has to live up to his father's name by becoming an all-star player himself. With great dreams, as soon as he reaches fourth-grade, he promptly joins the same little league baseball team his dad played on, the Mifune Dolphins. However, things don't go as planned. After only the first couple of practices, Daigo's lack of talent and inherent baseball sense shows, and his confidence is crushed. Unable to bear the pressure of living up to his father, a baseball prodigy, he quits the team in less than a year. Two years later, now in sixth-grade, a transfer student joins Daigo's class. This student turns out to be Hikaru, the son of Gorou's lifelong friend and fellow baseball star, Toshiya Satou. One day, Daigo's mother receives a call from the Dolphins requesting players for a game, so she forces Daigo to attend. To Daigo's surprise, he finds Hikaru there. Even more shocking is that despite his father's occupation, Hikaru has never played baseball before! Unlike Daigo, though, Hikaru immediately picks up the game demonstrating excellent performance. Needless to say, Daigo and Hikaru are polar opposites of each other. But this friction will inevitably thrust both of these inexperienced children into the world their fathers cherish—the world of baseball. [Written by MAL Rewrite]

Kimagure Orange Road OVA is basically the extension from the TV series. The time frame is probably in the middle of the TV series. Order to view with the TV series. White Lovers - among the episodes 35 and 45 Hawai Suspence - among the episodes 17 and 25 I was a cat, I was a fish - among the episodes 17 and 30 Hurricane Akane, the shape-shifting girl - among the episodes 20 and 25 Spring is for Idols - among the episodes 23 and 30 Birth of a Star - Right after "Spring is for Idols" Unexpected Situation - after the OAV of Akane Message in Rouge - after the episode 48