Continuous Fire! The Wind-Swept Shore of Battle!

Lina and the gang split in two diffent groups, Xellos, Amelia and Zelgadis in one, while Lina, Gourry and Filia in another. They need to explore two different cities at the same time that seems to be holding magical vessels. The two countries, Alto, and Bantone hate each other, and Lina and the group experiences their daily cannon ball fight against each other. We find out that the King's daughter of Alto, Sera, had befriended and fallen in love with the Queen's son of Bantone, Marco. Both sides, approach each group and they have a plan on stealing the magical vessels. As they do that in the middle of the night, both sides is alerted somehow. They all head for a tiny island that seems to be in the middle of the sea that is blocking them, and each city heads there too. Wait there is even more... creatures show up wanting to take the magical vessels what will Lina and the gang do next?