The story begins with a young woman waking up within the confines of an unknown, mysterious mansion with no recollection of how she got there. Adding to her confusion, she can no longer remember her name or past. However, before she could come to grips with her predicament she is suddenly attacked by a grotesque monster and is forced to run for her life.
The protagonist eventually comes into contact with others who also have no recollections of their pasts or how they ended up at the mansion. With only the enigmatic command “Complete the Kaleidoscope” to guide their way, the group sets off to hunt down the mysterious black butterflies that envelop the monsters of the mansion and recover their lost memories.