The story and plot of OMORI revolves around a boy named SUNNY and his "alter-ego" OMORI. The game has two primary locations the story takes place in. The imaginary world of HEADSPACE is explored through OMORI and his friends at night, whereas SUNNY explores the real world via FARAWAY TOWN at daytime. There are also two routes that will ultimately determine the outcome of how the story will end.
Depending on the choices made, the main focus is that SUNNY must overcome whatever's troubling him throughout the game and move on from the past. He will also have to conquer his fears and secrets while trying to reconnect with his old childhood friends along the way.