Watashi ga Hannin desu

Nakano Akane is a genius high school student who was admitted to Seiran Gakuen, a preparatory school with a deviation score of 78 and the highest rate of students going on to Tokyo University, with perfect scores in all subjects in the entrance exam, the first school since its founding. However, because she is too smart, she feels that the world is boring and is bored, and is unable to find meaning in life.

However, after a murder occurs in the city and she meets Kurokawa Yu, a young man believed to be the culprit, she is drawn to a new world, the world of crime, and begins to cause small incidents at school. Eventually, a real murder occurs at the school. This develops into an unprecedented series of murders that shocks Japan...