YU-NO: A Girl Who Chants Love at the Bound of This World

Yu-No: A Girl Who Chants Love at the Bound of this World is a Japanese visual novel/ point-and-click adventure game developed originally as an adult game. The game's protagonist travels between various parallel worlds in order to solve the mystery of his parents' disappearance. Although parallel worlds are not an unfamiliar concept in science fiction, the game uses concepts from physics, mathemati…