Ninomiya Hotaru, 17 years of age and the successor to the world's richest man has a dream. In his dream he kills a man, but it feels oddly real. Suffering from a condition where he hallucinates and has illusions of a life he never had, he always questions his world around him.
Or maybe it is all real, or just a distant memory?

After the assassination attempt on Akame, he falls victim and finds out he is an alien. The world around him so peaceful turns into a playground for the powerful as war breaks out again between the future and the invader. At the middle of this stands a Ninomiya, he is told that he must kill an entity named 'Akari' if not then the world would be no more.