Clavitas: Memory Full... Overwrite‪?‬

A lonely girl who can only remember a day’s worth of memory, and who can only remember more by deleting some. A boy who ventured to go to the world of memory to save her and find the so-called Clavitas that can help her. Will there be a happy ending for them as the boy must also face his own nightmares, fears, and terrors in such world?