MADDER: I Am the Culprit in That Case

Nakano Akane (Mao Ioki), a genius high school student with a standard deviation of over 78, meets Kurokawa Yu (Ryuta Yamamura), a young man who is believed to be the perpetrator of a murder case, and causes a small incident at school, which eventually leads to a serial murder case that will shock Japan.

The culprit himself is working behind the scenes to solve the stone statue destruction case! With the assistance of Akane (Ioki Mao), who has grown impatient with the lack of progress in the search for the culprit, the truth is revealed! What is the secret hidden in the stone statue?

The Unification of Seiran is suddenly canceled! Behind it all lies the motive of an analogue teacher who is fighting alone in rebellion against the school! Akane (Ioki Mao) motivates the foolish geniuses to move on to the next plan...