Kamikuro Eleven

The Kamikuro Eleven/Blacksoul Eleven (神黒イレブン) are the main antagonist team in the fourth book. Their captain is Kenzaki Ryuuichi.

Story
The first encounter with Shin Aliea was in Eufor Village, when they crept behind a counter and served them in black masks. However, they had several encounters between then and their final match, one of which being a kenjutsu battle. One time, Kenzaki planned on a match, and had a great opening plan when Kamikuro Seto wrecked it for him and postponed it for three days, resulting in Seto’s light punishment.

They did play one match, though, a practice match. Shin Aliea won by one point due to Kamikuro letting them.