From Google Translate

When the adventurer party "Burning Soul" posted a recruitment call to fill a vacancy, the one who appeared was Helut—an elderly, frail-bodied mage who wielded nothing but elementary magic. Though outwardly nonchalant, he exuded a subtle yet ominous aura, and time and again, he saved the party from peril using utterly unexpected methods. Later in their journey, Helut encountered Catena—a young girl living in a village shrouded in mist—and the two soon found themselves traveling together...

—Who, exactly, is he? As Helut continues his journey—clutching a shard of ice that no human power can melt—it seems he harbors a secret of his own.