Koganei Maru is the ship, where Kōichi (Sōsuke's father) works. He is the captain on it. The ship is seen in the film Ponyo on the Cliff by the Sea directed by Hayao Miyazaki of Studio Ghibli. The ship is equipped with spotlights, the only way to talk to Kōichi's wife Lisa and his son Sōsuke.

The crew has to stay firm, because they get into a tsunami, that suddenly appeared. They also clash into a graveyard of ships. Lucky, Granmamare came by and save them. At the end of the film, they come home well and sound.