ZERO: The Last Summoner

Kael Ardyn was living an ordinary life—until a mysterious phenomenon suddenly sends him to the strange world of Elyndra. Surrounded by monsters and with no way home, Kael encounters a mysterious girl named Ruun, who reveals that his existence may be the key to saving a dying world. With a mysterious System awakening within him, Kael must accept a dangerous contract and begin a journey that will change his fate forever.