A father vanishes into black light, leaving only a weapon and a cryptic instruction. From that single image, the entire mystery unfolds, not through exposition dumps, but through Ires moving through a world that refuses to explain itself, trusting you to piece together what Gramnoa actually is. The OVA knows its audience has played the games; it doesn't pause to catch you up, it just hands you the device and watches you figure out why it matters.
Ires spends his days working as a peddler alongside his father Leglight, moving from town to town with their wares. Their routine life shatters when they cross paths with Yuan, a skilled warrior whose hair crackles with elemental power. Yuan mistakes them for thieves and attacks without hesitation. Leglight defends himself with a mysterious device, driving Yuan back, but victory comes at a devastating cost: a surge of black light consumes him entirely, leaving only the weapon behind and a cryptic instruction to seek out someone called Oldman in the nearby city of Gramnoa. Left alone with nothing but his father's device and burning questions, Ires begins a desperate journey toward Gramnoa. The weapon hums with strange energy in his hands, and each step forward reveals that his father's disappearance connects to forces far larger than a simple misunderstanding on the road. Ires must uncover what his father was truly hiding and what role this ancient device plays in a conflict he never knew existed.