In a world of revolution, crimes and wars aren’t fairly common. Earth is at its last standing point, as wars are carried out against countries even if allies. For you, you watched your girlfriend, Eiri get killed directly infront of your eyes and have been coping since. Luckily, this time of age is just the right time as you were able to create a device that allowed you to travel through multiverses. And on your first trip.. you immediately find Eiri again.. albeit different.