The protagonist, who is a student at the best magic school in Japan "Babel", is a successor of a family of black magicians, thus having the power to absorb others' magical power. Moreover, he also can use demonic magic, albeit crudely.

On the surface, the reason for his enrollment to Babel is to strengthen his own magic and revive his family's sorcery. However, the truth is that, whenever he uses absorption, he feels immense pleasure, and his opponent also becomes more aroused. The stronger the magic, the stronger the effect.

"What will happens if I absorb magical power from the strongest magicians?"

And his targets are the top 3 students: childhood friend - Nao, discipline committee leader - Reika, and student council president - Amane.
Source: VNDB