Two OVA episodes featuring additional stories. Episode 0: Ritsu and Takano used to date back in high school, but broke up due to a misunderstanding. This is that story. Episode 12.5: Hatori and Chiaki go to visit the latter's family. It's really awkward in many, many ways.

The intense Baseball World Cup has reached its conclusion. Gorou Honda has regained his passion for baseball and is once again back in full gear. He has secured a team position with the Hornets and has travelled back to America to prepare for his spectacular debut as a Major League pitcher. However, Gorou encounters a sudden series of unexpected issues and devastating events follow, crushing his motivation and potentially reducing the baseball career that he has worked tirelessly to maintain into crumbs. In the final season of Major, Gorou must yet again overcome immense hardship in order to save his baseball career. This time there is no simple solution, as the problem is deeply rooted within his own mind... [Written by MAL Rewrite]

After toiling away in his lab, the alchemist Jolly has finally succeeded in making a personality-swapping potion that is guaranteed to bring him entertainment. The boys of the Arcana Famiglia are tricked into taking the potion and find themselves in bodies that are not their own. With this successful experiment, Jolly has paved the way for a plethora of uncomfortable scenarios. However, despite the boys' desperate struggle to switch themselves back, there is something to be learned from spending the day in someone else's shoes.

The distant future. After reaching its peak, Earth's population fell into decline. AI was developed to help preserve the species and manage the ecosystem; a grand experiment in human diversity. Through genetic engineering, a diverse array of peoples, including beastfolk, magical beings, and more, was created to live in a diverse city separated into walled "clusters". Each cluster developed a unique culture, befitting of the people that lived there. Their lives, and the system, is continually maintained by the AI to ensure survival.