YU-NO: A Girl Who Chants Love at the Bound of this World (この世の果てで恋を唄う少女YU-NO Kono yo no hate de koi o utau Shōjo YU-NO), is a Japanese visual novel / graphic adventure game developed and published by ELF Corporation, originally as an adult game for the PC-98 in 1996. It was written and produced by Hiroyuki Kanno, while its FM-synth music soundtrack was composed by Ryu Umemoto, Ryu Takami, and Kazuhiro Kanae; who had previously worked on C's Ware titles such as Eve Burst Error (1995).

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, mathematics, philosophy, history and religion to construct a unique fictional universe. In particular, the "A.D.M.S." or "Auto Diverge Mapping System," which visually displays the branching parallel worlds/storylines as a tree, aids the player in navigation.