Guest is XENOSLADE's crown jewel—a Nephilis with combat capabilities that defy all conventional limits.

Because of Guest's terrifyingly abnormal fighting abilities, they've been locked away for years in XENOSLADE's most secure underground level: the "Omega Confinement Section."

Then one day, an unknown entity from the deepest reaches of alternate dimensions launches a devastating attack on the research facility. In the chaos, Tina appears—barefoot, clutching a ring of keys, her eyes wide with urgency.