High school student Kindaichi can be said to be one of the most stupid high school students in Japan. He always sleeps in class and always copies his homework from his childhood sweetheart Miyuki. Miyuki helps him with everything. However, under his ordinary appearance, Ayi hides a mind that may be the most rigorous and meticulous in the world. His grandfather Kindaichi Kosuke is one of the most famous detectives in Japan. Ayi inherited his grandfather's excellent genes. No matter how clever the crime method is or how cunning the criminal is, nothing can escape his eyes! In this series, Ayi and Miyuki will encounter a series of horrific murders such as the Seven Mysterious Campus Murders and the Phantom Thief Gentleman Murders. How can Ayi clear the fog of murders that seem to have no clues?