Megami is the heiress to Saikou Corp, the most powerful business conglomerate in Japan. She is impossibly wealthy, a certified genius, has extensive self-defense training, has excelled at everything she has ever attempted to do in her entire life, and has been trained to possess all of the qualities of a perfect leader, to prepare her for the day when she will inherit her father's company. She is also the most beautiful girl in school, the most popular girl in school, AND the student council president, too.

Megami has been absent from school for nine weeks under mysterious circumstances that she has not disclosed to anyone. She has still managed to keep up with her schoolwork by attending class through a laptop, and has also been able to manage the school's student council by attending meetings via video call. She is noticeably upset about this; she strongly believes that she should be attending school like a normal student, and is resentful of her current situation, although she is not at liberty to explain the reasons for her absence.

Megami, unlike all other characters, is fully aware of the fact that there is a dangerous person on school grounds. Once she arrives at school, she will do absolutely everything in her power to protect the school's population - that includes installing security cameras, hiring security guards, and instating a zero-tolerance policy for suspicious behavior. Megami clearly has some very important information that would cause her to go to such extreme lengths...but what does she know? Does Saikou Corp have anything to do with it? And, more importantly, does Senpai have anything to do with it?