[Machine Translation] Takumi lost his life due to the mistake of Sylphiriel, the god of wind, and was reborn in another world. After protecting twins Allen and Elena in the forest, he began his life as an adventurer. On his way to the port town, Takumi stops by the beach to show his children the sea, where he meets a mermaid named Mirena. She told him that there was a problem in the mermaid village, and she had come to Takumi to ask for help. Takumi and his friends are taken by Mirena to the mermaid village on the ocean floor, where they quickly solve the problem. In return for their hospitality, they were invited to stay there. Allen and Elena were intrigued by the scenery of the sea for the first time. Takumi and his friends enjoy the undersea world to the fullest, taking a walk on the sea floor and conquering the sea labyrinth!