DEEMO II takes place in a world where it never stops raining… but this is no ordinary rain. Any creature touched by this rain turns into a flurry of white flower petals before entirely disappearing from the world. As such, everyone has taken refuge within a huge train station, including our female main character, Echo. There happens to be a giant piano in this train station that, when played, cuts through the clouds, allowing the sun to shine through, while also protecting the train station from the threat of the rain.