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]

The story takes place on an island, where a "Fractale System" is beginning to collapse. One day, Clain finds an injured girl called Phryne under a cliff. She disappears leaving a pendant. Clain sets out for a journey with the girl-shaped avatar Nessa to look for Phryne and discovers the secret of the Fractale System.

Yamada Elf's Love Song As a novelist with works getting adapted into anime, Elf Yamada holds an event to celebrate her success and to thank everyone who had supported her. With her mother attending, she becomes more excited. However, just as her mother arrives, she tells Elf to go back home so that she can find a suitable husband. Elf, who harbors feelings for Masamune Izumi, chooses to say no… Cooked Meals of Pure Love Winter has come, and it's freezing outside. With her brother Masamune catching a cold, Sagiri Izumi decides to nurse her brother into good health by stepping outside the comfort of her room and doing the housework herself. [Written by MAL Rewrite]

Upon meeting for the first time, undefeated street fighter Marcus Damon and renegade Digimon Agumon become friends in the most natural way possible for the knuckleheaded duo—by fighting their hearts out. The self-proclaimed "ultimate team" are recruited by a secret government organization called the Digimon Data Squad, or DATS, who had witnessed an unbelievable human fighting blow for blow with a Digimon. Their primary objective is investigating mysterious problems caused by Digimon entering the real world, and the world is currently in the midst of a crisis with Digimon appearing at an unprecedented rate. Embarking on various missions with DATS, Marcus and Agumon become colleagues with adolescent genius Thomas H. Norstein and his Digimon partner Gaoman, along with the kind-hearted Yoshino "Yoshi" Fujeda and her Digimon partner Lalamon. As the group continues to investigate the rapid increase of Digimon in their world, a darker truth begins to surface, and it is up to Marcus, Agumon, and their friends to get to the bottom of things. [Written by MAL Rewrite]