The Demon Sword Master of Excalibur Academy, Vol. 14 (light novel)

The Undead King meets his demise, rent by the newly awakened Holy Sword. Following his end, the dimension containing the Otherworldly Castle collapses, sending everyone within hurtling through space. Leonis and Riselia find themselves on a strange island far from the Seventh Assault Garden and eventually come face-to-face with a mysterious figure from the Hero’s past. Leonis has an important choice to make: Will he at last confide in his minion the truth of his dark history, or will he keep her in ignorance?