The heroine, Hikaru Tsumura, and her friends had to take supplementary lessons because they scored the lowest in their class. One of the guy in the supplementary class, Abe, smirking at his phone while the others were complaining about the teacher who gives them the lessons. The heroine who saw him smirking alone, snatched his phone. The phone screen shows that Abe won an AV screenplay award, the heroine was surprised to saw her photo and her friends were posted and labeled as the AV actress on that website. Suddenly a mysterious creature called The Ruler appeared out of the phone screen and locked them in enclosed space, in order to get out of the classroom they had to finish a little game. An attempt of escape won’t be tolerated.