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 place to place with their wares. Near Gramnoa, they run into Yuan, a gifted fighter known as a tempest. Yuan takes them for bandits and attacks. Leglight wields a mystic weapon and drives Yuan back, but right afterward a black light swallows him. All he leaves behind is the weapon, called a device, and a message saying to visit Oldman in Gramnoa. Hoping to find his father, Ires sets out for Gramnoa in this single-episode action fantasy OVA.