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Ys IX Prequel: The Lost Sword (イースIX 前日譚 ~亡失の竜剣~ Ys 9 Prequel: The Lost Dragon Sword?) is a short novel included in the Limited Editions of Ys IX: Monstrum Nox. It takes place between Ys Seven and Ys IX: Monstrum Nox, bridging the timeline blank between the two titles.

A digital version of the novel was also included in the Steam version as a Launch Week Special for buying the Deluxe or Ultimate editions in the first week after release.

The novel features Adol, Dogi, and a female blacksmith called Cesilica Kentia, who mentions Balduq to Adol and piques his interest. The novel's title "The Lost Sword" refers to Adol's ultimate sword from Ys 7: Caliocerion.

The novel also makes minor references to the events of Ys VIII: Lacrimosa of Dana and the Primordials.