Disappointed to see that she needs to pay to continue playing her favorite otome game, 16-year-old Hikari decides to try hacking for the first time, only to find herself arriving at an uncanny place, with all the boys from her game standing ahead of her, through a strange series of codes. Little by little, mysteries begin to unravel, and it turns out that this supposedly heavenly place is a man-made world created for large-scale human experimentation...