OVA episodes bundled with the 8th and 11th volumes of the manga.

Takeru continues his education at Tenbi Academy as part of the newly formed Security Committee. As a team with the other members, they battle unscrupulous individuals who use their Maken for evil purposes. In the meantime, his libido and the conflicting romantic interests of the girls surrounding him complicate matters considerably. (Source: ANN)

Fate had never been kind to Ji Ning. Wracked by illnesses and infirm his entire life on Earth, Ning knew early on that he would die as a teenager. What he didn’t know was that there really was such a thing as life after death, and that the universe was a far larger place than he thought. A lucky twist of fate (one of the few in Ning’s life) meant that Ning was reborn into a world of Immortals and monsters, of Ki Refiners and powerful Fiendgods, a world where Dynasties lasted for millions of years. A world which is both greater and yet also smaller than he ever could imagine. He would have the opportunity to join them, and in this life, Ning swore to himself, he would never let himself be weak again! The Era he was born into was a Desolate one, but Ning would make it his era. (Source: Novel Update)

After the defeat of Myouri Unzen at the hands of Medaka Kurokami and her Student Council, peace has returned to Hakoniwa Academy—at least, for a short while. Soon, Medaka, Zenkichi Hitoyoshi, Kouki Akune, and Mogana Kikaijima find themselves wrapped up in another sinister scheme, known as the Flask Plan, led by the school's principal himself. However, the council's first problem is to deal with a whole new group of superhuman students calling themselves the Thirteen Party, led by the egotistical but powerful Oudo Miyakonojou. With the mysterious Flask Plan, Oudo's tyranny, and the resurfacing of an old enemy, the state of Hakoniwa Academy is far from tranquil, and Medaka and her companions have their hands full as things only get a lot more abnormal.