In the flawless Mirror City, "resident" No. 734 Lived a perfectly planned life until an accident awakened his erased memory fragments. A mysterious woman, a rain that shouldn't exist, and a vague concept called "home" force him to question this utopia controlled by "managers". In order to recover his identity and truth, he must escape from this gorgeous prison built of data and lies, and become the enemy of the entire world in the maze of memory.