Schrodinger's Girl Friends

is a Japanese light novel series written by Nanami Watari, with illustrations by Mogomo. The series began publication on September 10, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Aoi, a boy who boasted that sleep is the supreme joy. From an early age, he had a big secret that no one could tell, going back and forth between parallel worlds every time he slept.

And one morning, from a casual word of Aoi, the world where the two childhood friends Shinho and the smile are "overlapping" for the first time ...

The last thing that remains is true treasure, howling, or-the SF youth love story to give at the end of summer.