Off-duty Japan Self-Defense Forces (JSDF) officer and otaku, Youji Itami, is on his way to attend a doujin convention in Ginza, Tokyo when a mysterious portal in the shape of a large gate suddenly appears. From this gate, supernatural creatures and warriors clad in medieval armor emerge, charging through the city, killing and destroying everything in their path. With swift actions, Youji saves as many lives as he can while the rest of the JSDF direct their efforts towards stopping the invasion. Three months after the attack, Youji has been tasked with leading a special recon team, as part of a JSDF task force, that will be sent to the world beyond the gate—now being referred to as the "Special Region." They must travel into this unknown world in order to learn more about what they are dealing with and attempt to befriend the locals in hopes of creating peaceful ties with the ruling empire. But if they fail, they face the consequence of participating in a devastating war that will engulf both sides of the gate. [Written by MAL Rewrite]

Now that Koyomi Araragi and Hitagi Senjougahara have graduated, very few familiar faces remain at Naoetsu Private High School, one of them being Kanbaru Suruga, holder of the Monkey's Paw. When she begins to hear talk of a mysterious being known as the "Devil," who will magically solve any problem, she immediately thinks these rumors are about her and decides to investigate. She discovers the Devil is actually Rouka Numachi, a former rival from junior high who is providing free advice to those who seek her out now that she is no longer able to play basketball due to a leg injury. Acting as a collector of misfortune, she enjoys relieving the stress of her clients by providing them with the false hope of having their problems solved. Although Kanbaru sees no real harm being done, she reprimands Rouka for lying and heads home, relieved she is not the cause of the rumors. But when she finds that her left hand has reverted back to its human form, she may have a reason to worry after all... [Written by MAL Rewrite]

Koyomi Araragi is studying hard in preparation for his college entrance exams when he begins to notice something very strange: his reflection no longer appears in a mirror, a characteristic of a true vampire. Worried about the state of his body, he enlists the help of the human-like doll Yotsugi Ononoki and her master Yozuru Kagenui, an immortal oddity specialist. Quickly realizing what is wrong with him, Yozuru gives him two choices: either abstain from using the vampiric abilities he received from Shinobu Oshino, or lose his humanity forever. [Written by MAL Rewrite]

Several years ago, local heroines—superhero characters who represent towns and perform stage shows in order to raise their town's acclaim—had a boom in popularity. The most famous of these local heroines, Kamidaio, is scheduled to perform in the small town of Hinano, much to the excitement of Mikan Kise's little sister Yuzu. Unfortunately, when Mikan takes Yuzu to the show, she finds out that it has been canceled. She promises her distraught sister that she'll make sure she can see the show. Desperate not to let her down, Mikan asks her classmate, the local heroine fanatic An Akagi, for help. Mikan and Ann put on their own Kamidaio performance clad in homemade costumes, which the kids in the audience love despite its lack of production value. The show is recorded by the student council president Misaki Shirogane, who posts it online to garner attention. Misaki is from a family of politicians and has taken it upon herself to revitalize Hinano. Impressed by their show, she recruits Mikan and An to become the official local heroines of their town. As the group works to improve their shows, they enlist the help of a variety of colorful individuals. [Written by MAL Rewrite]