In this visual novel, a future where Earth has been abandoned by humanity due to climate disasters and social collapse, ECHO, an autonomous robot, continues the mission to clean up and preserve the remains of human civilization. For centuries, ECHO has worked tirelessly in a desolate landscape, holding out hope that one day humans will return.

One day, ECHO discovers an unexpected sign of life in the form of a small plant growing among the rubble. This discovery awakens in him a renewed sense of purpose and hope.

With determination and courage, ECHO embarks on a mission that could change the fate of the Earth forever.