A heart-changing operation gave the girl a good personality in the morning, and her second personality had the ability to reason, called Edison. Edison led Summer Good Morning into a series of serial killing plots. Inferred genius Mikaka to help his friend Xia Zaoan to find out the secret hidden behind Edison's personality, and formed a campus genius to solve the duo. The classmates were kidnapped, the class teacher was killed, the strange and mysterious student Qi Qi, the seemingly unrelated piecemeal clues were put into a line, and the murderer pointed to the mysterious organization named "Poker". What is the organization of playing cards, why the execution of this serial murder, who is Edison’s true identity, and the mystery behind the mystery, the truth is more than one.
