Re:ZERO -Starting Life in Another World- Ex, Vol. 2 (light novel)

When a devil falls for an angel… Long ago, a great war raged between the royal military of Lugunica and the demi-humans. On that battlefield, a noteworthy young warrior was born—Wilhelm Trias, dubbed the Sword Devil. But despite his skill with a blade, the boy would need to grow much more before he could become a true hero.
This is the story of a legendary swordsman–and how he learned to love.