In this peculiar world, Concepts such as Space, Time, Life, Death, and Sorrow roam the lands - all of them given unique abilities to shape the world to their will.

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Heart is a Concept living on an island as a hermit, and she would be content living out the rest of eternity as a hermit.

But one night, her island is unwillingly dragged into a battle between powerful Concepts, and she is forced to leave her home in order to find a new one.

Though the path ahead promised no refuge, Heart must move forward regardless and search for a new home - in this dangerous yet beautiful world where Concepts ruled the lands.