One day ends, another starts. For Michiru, life is an endless cycle of studying and sleeping. But it's not only studying that Michiru has on her mind. She has a troubled relationship with her mother that often makes her feel unwanted and useless. That is until one day, an exact copy of her appears from through the mirror! Sending the copy to go to school in her place, Michiru now has all the time in the world. While playing games at the game center, she encounters a girl similar to herself in many ways, and a new friendship quickly blossoms.