This is simply the OVA summing up the major events and battles of Initial D 4th Stage much like the Initial D Battle Stage original summed up the first 3 seasons. Additionally, has 2 extra battles from the manga that were not incorporated into the original 4th Stage. (Source: ANN)

The moment of reckoning has arrived as the illustrious Football Frontier International is finally underway. After winning the national Football Frontier, the newly assembled Raimon Junior High School soccer team awaits the announcement of Inazuma Japan—the team of players who will represent Japan at the international tournament. Asuto Inamori, along with the Demon of the Field Ryouhei Haizaki and the Emperor of the Pitch Yuuma Nosaka, quickly realize that they are up against forces far greater and more powerful than they anticipated. In Inazuma Eleven: Orion no Kokuin, mysterious powers are at play within the tournament that threatens to alter the course of history and the game of soccer itself. With the help of their cunning coach Zhao Jinyun and the inexplicable newcomer Ichihoshi Mitsuru, Inazuma Japan must defend the world of soccer in their most difficult challenge yet.

As Shinsei Inazuma Japan was about to have a match with Inazuma Legend Japan, a mysterious attack of a person and a swarm of robots interrupted, and another mysterious girl's power drove the world into another dimension. As the world of Inazuma Eleven Go and Danball Senki W met, the two teams must work together to find out what happened to their worlds. (Source: Wikipedia)

A project was launched where scientists discovered a mysterious substance that can interface directly with the human brain. This substance, called Exotic Matter (XM), has existed since ancient times, influencing human minds and the progress of humanity. In the wake of this discovery, a battle of powerful nations and corporate giants has been unleashed. Organizations across the globe have embarked on a secret race to exploit XM. It represents both an opportunity and a threat to humanity. Two Factions seeks to control the XM. The Enlightened view XM's power as a gift that enhances human experience and discovery. The Resistance sees XM as a hostile takeover of the human mind, choosing technology as humanity's best path forward. XM, and the mystery behind it lie at the center of this battle for the fate of humanity. 2018—Now, a new struggle is about to unfold in Tokyo and across the globe. Dangerous and powerful forces seeking to exploit the potential of XM will collide. This groundbreaking project will mark the beginning of an epic augmented-reality experience combining the three elements of animation, location-based gaming, and the real world. (Source: MAL News)