"Tokyo Revelation" is a three-episode OVA series that blends elements of supernatural horror, action, and dark fantasy. The narrative centers on Tatsuma Hiyuu, a young man who becomes entangled in a dangerous conflict involving ancient demons, divine powers, and the fate of Tokyo. Tatsuma possesses a mysterious power tied to his lineage, which draws the attention of both malevolent forces and those seeking to protect humanity. His childhood friend, Mutsuki Kamio, plays a pivotal role as she is revealed to be a key figure in the unfolding events, connected to a prophecy that could determine the balance between good and evil.

The story begins with Tatsuma and Mutsuki encountering a series of supernatural disturbances in Tokyo, which escalate into a full-scale battle against demonic entities. These demons, known as the "Four Divine Beasts," are ancient beings seeking to reclaim their power and destroy humanity. Tatsuma's latent abilities awaken as he is forced to confront these threats, revealing his connection to a divine entity known as the "Dragon King." Mutsuki, meanwhile, is revealed to be the reincarnation of a priestess destined to either save or doom the world, depending on the choices she makes.

As the plot progresses, Tatsuma and Mutsuki are joined by other characters, including a mysterious swordsman named Ryoko Suzaku, who has his own agenda tied to the divine beasts. The group faces numerous challenges, including betrayal, moral dilemmas, and the revelation of hidden truths about their own identities and the world around them. The narrative explores themes of destiny, sacrifice, and the struggle between human free will and preordained roles.

The climax of the series involves a confrontation with the Four Divine Beasts and the ultimate decision Mutsuki must make regarding her role in the prophecy. The resolution ties together the fates of the main characters, leaving lasting consequences for both the human and supernatural realms. The series is marked by its fast-paced storytelling, intense action sequences, and a focus on the interplay between its central characters and their shared destiny.