A kingdom created through music faces an uncertain future after a monster called 'The Ancestor' plagues the land with a destructive 'Hollow Rain'. This dangerous rain causes anyone it touches to 'bloom', turning into a flurry of white flower petals and ultimately vanishing from existence. DEEMO II follows Echo, a girl who has bloomed but mysteriously re-appeared, and Deemo, an enigmatic station Guardian, as they journey through this rain-soaked world in hopes of finding a way to save it.