Scuba diver Hiroyuki Arakawa and Yoriko are the unlikeliest of friends: Arakawa is human, and Yoriko is an Asian sheepshead wrasse fish. Nearly every day for the past 25 years, Arakawa has visited Yoriko at Hasama Underwater Park in Tateyama, Japan. One day, Arakawa discovered that she was injured. He nursed her back to health, and she came to trust him—and only him—ever since. Their relationship is a beautiful reminder that friendship has no boundaries.