Ranma ½: Kessen Tougenkyou! Hanayome wo Torimodose!

Ranma, Akane, and their friends set out on what should be a pleasant sea trip, only for a storm to wreck their yacht and strand them on a remote island. The situation becomes far stranger when the girls begin disappearing one by one.

The kidnappings lead Ranma to Toma, the young ruler of the island, who intends to choose a bride from the abducted women. To get everyone back, Ranma and the others must break into Toma's domain and face his formidable followers, while the island's own strange secrets make the rescue anything but straightforward.