Two OVA episodes featuring additional stories. Episode 0: Ritsu and Takano used to date back in high school, but broke up due to a misunderstanding. This is that story. Episode 12.5: Hatori and Chiaki go to visit the latter's family. It's really awkward in many, many ways.

Hajime Kindaichi's unorganized appearance and lax nature may give the impression of an average high school student, but a book should never be judged by its cover. Hajime is the grandson of the man who was once Japan's greatest detective, and he is also a remarkable sleuth himself. With the help of his best friend, Miyuki Nanase, and the peculiar inspector Isamu Kenmochi, Hajime travels to remote islands, ominous towns, abysmal seas, and other hostile environments. His life's mission is to uncover the truth behind some of the most cunning, grueling, and disturbing mysteries the world has ever faced. [Written by MAL Rewrite]

Renkin San-kyuu Magical? Pokaan follows the daily lives of four young girls. There is just one catch: they are anything but normal. This group of friends—the energetic werewolf Liru, the joyful witch-in-training Uma, the motherly android Aiko, and the seductive vampire Pachira—are actually princesses from the netherworld who have traveled to the human world in search of a new home. Unfortunately, their naivety and severe lack of knowledge make living peacefully among earthlings much more difficult than they imagined. As they attempt to adapt to their brand new lifestyle, they cause all sorts of trouble, and end up attracting the unwanted attention of a woman by the name of Dr. K-Ko. The scientist believes that these new residents of Earth are up to no good and attempts to capture the girls to prove the existence of the supernatural and gain credibility with the scientific community. Every day brings a new adventure as the girls deal with the insanity of her antics and all that the human realm has to offer.

Shortly before the upcoming festival, a year after the end of episode 12, Daigo decides to find a girlfriend to dance with in the festival. Will he be able to do so?