A.D. 2115—the island nation once called Japan is now known as the "17th Far East Imperial City Management District." The citizens were promised a life of peace in exchange for some of the comfort they were used to having. People believed their lives would never change and tomorrow will be the same as today. No one suspected the impending doom which their society was about to face. "Degradation"—a rare disease which led to the total disintegration of the human body to a mere pile of sand was slowly but surely spreading throughout the world. Tohru Kazasumi, an ordinary student becomes embroiled in a multi universal battle between his world and the parallel world of "Frontier S (Stratos)." This meant that Tohru must fight himself from an alternate world. Their futures collide as their paths cross. Will both worlds ever find peace? (Source: Aniplex USA)

This OVA is divided into two parts. First one is about Torii Shoutarou following his younger sister on a date. Second one is about Christmas Eve, which Mitsuki, Yuuya and their friends spend at Kanzaki's house. Bundled with the limited-edition volume 7 of the manga. (Source: AniDB)

After suffering from a shoulder injury, shy first-year university student Haruki Bandou gladly takes the opportunity to give up judo, failing to find happiness in the sport regardless of his family owning a dojo. He did not expect, however, that his best friend Kazuma Hashimoto would also decide to leave their university's judo club at the same time as him. Despite Haruki's protests, Kazuma already has plans for a new and revolutionary activity: a cheerleading team made up of only men. Although heavily reluctant, Haruki ends up helping his friend set up the team. Through sheer determination, and with support from their newfound club members, Haruki and Kazuma persist in founding the Breakers, the first ever all-male cheerleading team of Meishiin University, slowly making history in spite of the feminine tag attached to the sport of cheerleading and the prejudices, physical challenges, and self-doubts that inevitably follow. [Written by MAL Rewrite]

The story is set in Diamond Ore Country, of which Diancie is the princess.This is a country located deep underground, where the Pokémon Carbink live together in peace. The energy source of this country is a giant diamond called the Sacred Diamond, which can only be created by princess Diancie. However, the current princess doesn't yet possess the power to create such a diamond, and the current Sacred Diamond's power is soon going to run out, which would result in the end of the country. Diancie meets up with Ash and Pikachu, and set off together with them to search for the legendary Pokemon Xerneas, which possesses sacred power, but on the way, they find the cocoon where the Destruction Pokémon, Yveltal, who was said to have once destroyed life in Kalos, lies in wait.

(Source: serebii.net)