Touta Konoe is an ordinary boy raised in a small rural town. His mundane life suddenly changes when his mentor, Yukihime, reveals herself to be a vampire; after saving Touta from a mortal wound, she causes him to become immortal as well. Already yearning to explore the world, young Touta finally puts his dream to ascend to the top of Amanomihashira—a tower that leads to outer space—into realization. Along the way, he finds a secret society filled with immortals just like him called UQ Holders. Gaining new comrades and mentorship along the way, Touta embarks on his own unique, magical adventure.

Beginning with a recap of the coming of the Transformers to Earth and the story of Devastator, the OVA then gets its original story underway, as the Autobots are shown to be in the midst of constructing the powerful Scramble City, overseen by their newest arrival, Ultra Magnus. When the Decepticons learn of this, their combiner robots are deployed to attack, and a battle between them and their Autobot counterparts ensues. (Source: Wikipedia)

Seventeen-year-old Tenchi Masaki grew up hearing stories about how his ancestor used a sword to seal a demon inside a cave seven hundred years ago. When curiosity gets the better of him, Tenchi goes to the cave and stumbles across the sword from the legend. Thinking that the story is nothing more than a fairy tale, he removes the blade and inadvertently releases the demon, who turns out to be a space pirate named Ryouko Hakubi. Furious about being trapped for so long, she attacks Tenchi, but he is able to repel her with the sword, awakening his inner power. After seeing this, Ryouko takes an interest in her unlikely savior and decides to crash at his place. As if it were a chain reaction, more alien women—Aeka Jurai Masaki, an uptight princess from the planet Jurai; Sasami, Aeka's sweet younger sister; Mihoshi Kuramitsu, a ditzy Galactic Police Officer; and Washuu Hakubi, a wisecracking genius—gradually come in contact with Tenchi and begin living with him. Through his encounters with these five women, Tenchi begins to learn more about his ancestry, newfound power, and the looming threat lurking beyond the skies.

In a forgotten town known as the old capital of Tokyo, strange and mysterious crimes are progressively occuring. These supernatural occurances are beyond comprehension and bring fear and terror to the people. Only one person is not intimidated by the evil underlying these occurances and is willing to challenge them: Hyuga Mayuki, a young boy detective who holds a special insight power that allows him to uncover the real truth behind these occurances. (Source: ANN)