Ultraman Cosmos 2: The Blue Planet

Ultraman CosmosTHE BLUE PLANETTHE BLUE PLANET , Urutoraman Kosumosu Ts Za Bur Puranetto? is Cosmoss second theatrical film adaptation, Kaiju film and was released in Japan on August 3, 2002. It is a tokusatsu film in the Ultraman franchise, it is also a direct sequel to the original Ultraman Cosmos television series.

Musashi attended his childhood friends wedding in Saipan. His friend Mari caught the bouquet. During her lunge, Musashi saw a strange woman in the ocean, who suddenly leapt into the air, proving to be a mermaid. One of his friends, Tutomo, mocking him for believing he saw a mermaid but Mari objects, implied that Musashi might be talking the truth ever since his first encounter with Cosmos. As it starts to rain, Tutomo cowardly hides under the table with Mari mocking him, causing Tutomo to take a nearby soda and spraying it on Mari, starting a soda fight with his friend as they watched again by the mermaid.The next day, when Musashi and Mari went snorkelling, they discover a portal underwater and at the same time ambushed by a stingray kaiju. As Musashi about to follow Mari, he knocked down unconscious. Later, to figures approach to him. One a man and the other a womanmermaid that he witnessed before. The man decide to eliminate Musashi for interfering them but the objects, only for too late as he already fire an energy blast to Musashi. He awakens at the hospital as his friends visits him but Mari was nowhere to be seen. Then, Koji, an original member of SRC and now a captain of Team SEA approaches him as he glad that he survives. Musashi was taken to their base and revealed that the monster he encounter earlier was Reija, who was detected undersea a year ago. ........

Source: Wikipedia