The leading engineer of the development of the little robots afterward named LBX, and also father of the main character [Ban Yamano](https://anilist.co/character/42545/Ban-Yamano).

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 > He supposedly died 5 years prior to the beginning of the series, but is actually held captive by the Innovators. 
 > He entered the Artemis Tournament using the secret alias Masked J, using the LBX "Masquerade J".
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In 2046, a revolutionary 80% shock-absorbing reinforced cardboard has been developed, rapidly transforming the world's exports. The reinforced cardboard would soon become the battleground for a popular children's hobby called "LBX" (Little Battler eXperience).<br><br>
Four years later, a boy named Yamano Ban who loves to play with LBX (although without a mecha himself) is given a case containing the model AX-00 by a mysterious woman. He is told that he now holds the hopes and despairs of mankind in his hands. 

The "Inazuma Legend Japan" that won the FFI one day and the "New Inazuma Eleven", that played through the Holy Road Tournament are having an exhibition match. But suddenly a  lot of little objects appear and start attacking the stadium. They were the little robots "LBX", a technology never saw before in that world. Tenma and his friends try to respond to the attack, but the little robots continue to appear one after another, until Yamano Ban appears to save them. The strongest soccer team and the strongest LBX army are now united, and a fierce battle is about to begin!

One year after the fight with the Innovators, a new terrorist organization called the Detectors threatens the world using LBXs. Ban joins up with new and old friends to stop the Detectors.
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(Source: Anime News Network)

Junichirou Yamano