Osaka Academy plot

Centuries ago, this academy was built by 7 magical beings: A witch, a wizard, a black mage, a white mage, a fairy, a mermaid and a merman. Together they combined their powers to make this academy, for the young ones to learn their magic. The witch called Majou, built her own devision for all the witches to teach themselves new spells and learn. The wizard Shino, did the same for his students. So did the black mage Kuro, the white mage Shiro, the fairy Sora, the mermaid Mizu and the merman Kaoiosei. There was also another reason for them to built this academy. They wanted to protect all the magical beings from harm. They passed this academy from generations to generations.

Right now, in this present, the future to them, this academy is still standing. The headmaster is now a middle aged man, who is a witch. He comes from Majou's generation. He has a niece and that girl goes to his academy. Also the generation of the other magical beings, are also present at this academy. But the question is: Will this academy stay long?