When Demon Queen Echidna begins her invasion of the human realm, the people turn to the hero Leo Demonheart to protect them. Blessed with insurmountable power, Leo easily repels Echidna's army, thereby saving the world. But instead of gratitude or admiration, Leo is met with disdain and scorn from his fellow humans, who fear his overwhelming strength and believe that it may eventually cause humanity's demise. Banished from the kingdom he once called home, Leo wanders aimlessly throughout the land until, one day, he hears rumors of Echidna's efforts to rebuild her army. Hoping that demonkind might accept him as an ally, he returns to the demon queen's castle and offers Echidna his help. Naturally, Echidna immediately rejects him. Still, not all hope is lost, as Leo manages to convince Echidna's four generals to let him secretly work under their supervision. Donning the identity of a masked dark knight named Onyx, Leo solves the demon army's problems one by one—gradually improving the quality of life around the castle. Above all else, however, Leo wants to accomplish one goal: to learn why Echidna started the war in the first place.

It's been several years and Kyosuke Kasuga is now 19. A mysterious phone call warns him of oncoming cars but he doesn't listen. Ironically, he gets hit by a car and because of his telepathic abilities, gets sent three years into the future. His 22 year old future self is now a photographer who is lost in Bosnia and believed to be dead. Kyosuke must find his 22 year old future self and restore himself, the 19 year old, to his correct time. Along the way he reunites with Hikaru who is now a professional and famous dancer. Madoka is also there, distraught over both Kyosuke, the 22 year old, going missing in Bosnia and Kyosuke, the 19 year old, getting hit by a car.

A web series "Detective Conan vs. Wooo." This web short is an advertisement for the Wooo line of televisions in Japan.

Picture Drama episodes bundled with the Blu-ray/DVD Volumes. Sakuraba tries to draw Shirasaki, and things take a turn for the ecchi.