Demonio used to play soccer in the suburbs of Italy along with the rest of Team K. Due to the boys' shared dream of playing in the nationals, Kageyama (then known as Mr. K) sought them out and offered them a deal. Join him and they would be able to play in the nationals. He was a huge fan of Fideo, until he joined Team K in which he saw himself as superior and looked down on the rest of Orpheus.