Hamelin no Violin Hiki

A crisis strikes Staccato when demons suddenly appear and unleash devastation upon its people. The entire country is plunged into chaos, and the root of the calamity lies in the weakening of the barrier that has long protected the human world from demonic incursion. Sustaining this barrier for years has drained the strength of its keeper, Queen Horn of Sforzando. Seizing this opportunity, Hell King Bass strives to shatter the remaining defenses in order to free his faction's supreme leader, Kestra (Orchestra)—a being of unmatched power, now sealed somewhere within the human realm.