Finally realizing his true feelings, Mister Pig promises to go on a journey with Jess that will last forever and ever. But for that to happen, they must reclaim the capital from the Clandestine Arcanist's evil clutches. It's an uphill battle, but fortunately, they aren't alone—they're joined by the Liberators, Prince Shravis, two beautiful maidens, and two other porcine visitors from Mister Pig's world. The party advances to Terminus Island, seeking a trump card that could turn the tables on their desperate situation.

According to the records Vatis left behind, there are two important things hidden on the island: a supreme treasure and an entrance to a second Mesteria, the Abyssus. The key to eliminating the Clandestine Arcanist's terrible power lies within this other world. Mister Pig and Jess embark on a perilous quest into this realm of unknowns—they can't afford to fail.