15 years ago, the invaders known as the MU placed a dome around the city of Tokyo. Nothing can get in. No one can get out. Inside, the survivors do not even know if the rest of the world even exists, but then one young man starts to realize that something is very wrong with… his friends. His family. Everything. Suddenly cracks in the barrier have begun to appear, and a woman from outside the dome contacts him. A woman from a past he forgot. The flow of time has been changed, his “when” is not when he thinks it is, and somehow he is at the center of an alien plan to rewrite the flow of reality itself in RAHXEPHON!