Chiharu Kashima, captain of the Wizard Bureau's Crisis Countermeasures Division, is among a handful of people who can use magic. While frequenting his favorite bar, he is approached by a friendly man named Toyohi Utsumi. Having always dreamt of being a wizard, Toyohi is enthralled by the idea of meeting one. Much to the young Captain's surprise, Toyohi confesses that he has fallen in love with Kashima. While little time as passed, the two begin to spend more time together. Not all is well, however, as Kashima fears that magic is all that he has and Toyohi is only in love with Kashima the Wizard. [Written by MAL Rewrite]

Waking up from a nap, Kino is relieved to see that a certain tower from afar is still proudly standing. Located in the heart of the Tower Country, the immensely tall tower stretches high into the sky, reaching seemingly infinite heights. The tower looks like something out of a dream, but the breathtaking construction is unmistakably real. Intrigued, the traveling partners Kino and Hermes—the talking motorcycle—journey to the tower to get a closer look at the building. Despite already being unbelievably tall, the tower is still being built by the townspeople to this day. Puzzled by the origins of the tower, Kino and Hermes ask around the town for information, but they fail to obtain any definitive answer. They continue to observe both the tower and the townspeople during their stay, hoping to understand the reasoning behind building a tower that requires so much effort. After all, there is always something to learn... even from the strangest of countries.

Technology, science, and industry—this is 1969 Tokyo, and there is no better time to be alive! But a shadow looms quietly around every corner: "Invaders" have infiltrated the populace, and nobody knows who or what they are. Only the members of the top-secret agency AEGIS know of their existence. Covertly fighting the enemy is their job, but only those with the ability to open "Gates" to another world can truly defeat them. Within AEGIS is a specialized task force known as the "Gate Keepers." Composed of extraordinary individuals with a variety of Gate-related abilities, they are the only ones who can save humanity from the vicious Invaders plaguing the planet. Shun Ukiya is an average high school student who lives with his widowed mother and little sister. While on his way home from school one day, he comes across a group of Invaders heading toward his house. In a desperate plight to save his family, Shun discovers he possesses the ability to open a Gate, allowing him to harness massive amounts of energy. With his newfound ability exposed, he catches the attention of AEGIS, and particularly the interest of one of its Gate Keepers, Shun's childhood friend Ruriko Ikusawa. [Written by MAL Rewrite]

Several months after a probe returning from Mars burns up during reentry, strange creatures dubbed "Ancients" begin to appear throughout Tokyo. Aggressive and dangerous, they cannot be killed with ordinary weapons. As scientists struggle to find the cause of their sudden appearance, the monsters wreak havoc across the world. Humanity finds hope in the form of the MARS suit—a new weapon developed to take down these enemies. The suit, however, can only be worn by those with specific DNA. Enter Takeru Hinata, an ordinary teen with a troubled past and one of the few capable of piloting the only weapon against the Ancients. With the help of the AAST, a special police force established to defeat the dangerous creatures, the young man battles against demons both personal and global whilst trying to discover the true nature of Earth's new aggressors.