A story where you live life alongside an “invisible girl.” Kuro is an invisible girl, and Hyouma is a boy who can only see invisible people. To alleviate their loneliness, the two get close and live together, but “disaster” eventually bares its fangs and a cruel world stands before them. Parallel worlds. An invisible girl. A mysterious disappearance. An omniscient slate. Can you solve the mystery behind the irrational world and lead it to salvation before total despair arrives as result of repeated destruction and separation? This is a story of sadness and overcoming that begins with a meeting that has not happened yet, but is inevitable.