Yomichi is a normal girl living an average student's life—except for one thing: sometimes, after sunset, she finds herself transported into a different world. Be it a desert on the moon, a coffee shop inside of a tunnel, or an island in the sky, she enjoys her time in these new places, making friends each time. However, this leaves her with some questions. Do I really have to live in my daytime world? Is that life, the one where I go to school each day, the real one? In this story, she tries to find out more about the worlds surrounding her and what they mean for her.