With these words, Pure Sakurasaka crashes into Akira Kouno's life. As if it wasn't wild enough that she says she's come from six years in the future, Pure insists that in her time, she and Akira are engaged to be married! It's an impossible claim, especially since Akira has sworn off 3D romance, content to immerse herself in 2D dating games. Besides which, why would someone as cute as Pure be interested in a loner like her...?