Sorceress extraordinaire Lina Inverse gets dragged off by her over-endowed associate Nahga to a hot springs resort in Mipross. Shrouded in mists, Mipross has always presented a mystery to visitors and inhabitants alike. As Lina and Nahga get ready to enjoy themselves, weird things happen and equally weird people show up. Who's the man frequenting Lina's dreams, and how is he connected to the mystery of Mipross? Seems like a job for the Slayers... but only if there's a reward involved!
Lina and her associate Naga find a pair of tickets to Mipross Island on a group of no-good bandits they've just trashed. Given Mipross Island's notoriety for its hot springs resorts, the two sorceresses are more than happy to cash in on their good fortune.
Upon arrival, Lina and Naga are quick to partake of the tourist delights to be had at Mipross, but it soon becomes apparent that their vacation will have to wait -- since before their arrival, Lina has been having a recurring dream involving Mipross Island, and more baddie attacks than normal indicate that something bigger is afoot.
It seems that Mipross Island has a past, and that our two heroines will have to join forces once more to put right what once went wrong. Of course, all this will involve the usual explosive spell-casting and hijinks to be expected from Lina, and the usual hilarity as well. Fireball--!