Continues where Tantei Gakuen Q ended two years later. They are still in Dan Detective School solving cases.

With the genius-level reasoning ability he inherited from his grandfather Kousuke Kindaichi, Hajime Kindaichi has solved a great number of very difficult cases. But he is just a regular high-school student. Though he wants to get closer to his childhood friend Miyuki, he can't manage to make a move on her because no matter where they go, a terrible crime always occurs! Kindaichi hardens his resolve and invites her on a one-night mini-vacation! "This time it'll work for sure!" he says to himself. As goes without saying, this manga is a comedy spin-off of the popular work Kindaichi Case Files!