Demon Dog of the Sea (海の魔犬 Umi no maken?) is the 285th chapter of the manga and the first chapter of the Demon Dog Swimsuit Arc. The Tendos and Saotomes all go to the beach for a day of relaxation, but are surprised to find it is deserted. In the ocean they see signs warning of a dangerous dog, which seems like an odd place for such words of caution. After talking with some of the townspeople they discover that a demon dog lives in the sea and drags young girls to their deaths each summer. Ranma is sent to investigate and as he swims out to sea, where the demon crosses his path.