A young woman faints at work and wakes up in the back of the cafe where she works. She has no memories of her past or of those around her. She soon discovers that Shin and Toma are her two closest friends. They are there to help her return home. She meets Orion, a spectral boy that she can only see and hear. He tells her that she has lost her memories due to his chance visit to her universe, and he promises to help her find her identity.
It may prove more difficult for her to regain her memories without worrying about others. She must also be careful not to attract the attention of the mysterious Kent, the quick-witted Ikki and the worried Toma. Her amnesia slowly unravels her, as her memories are reconstructed piece by piece.