Reign of the Seven Spellblades, Vol. 10 (light novel) — Bokuto Uno

THE PAST RISES TO THE FORE
It's the final round of the combat league. Godfrey and Leoncio clash like titans, and Kimberly gets a new student body president. As the dust settles, Oliver is faced with Nanao's desires, Yuri's absence, and his comrades' plans to strike down a third target: Demitrio. The faculty's investigation demands swift action -- so the battle begins. Demitrio reveals secrets from the age of the divine. The comrades' path to victory collapses beneath them. And the desperate struggle begins to uncover even more dire secrets: ones trapped deep within Oliver's past…