A few months after the events of Steins;Gate, Rintarou Okabe and his group of friends are invited to tag along with their acquaintance Faris NyanNyan, who is participating in a Rai-Net battle event in the United States. There, they meet up with an old colleague: Kurisu Makise, who has been recalling fragmented memories of events that happened in the other world lines in the form of dreams. She confronts Okabe, questioning him as to whether these events—particularly the incidents between the two of them—did indeed happen. [Written by MAL Rewrite]

Shuurei Kou and her friend Eigetsu To, a boy prodigy of humble origins, have been appointed co-governors of the Sa province, one of the eight provinces in Saiunkoku. Together, they decide to make the province an academic research center in the hopes of bringing a long overdue prosperity to the region. However, while Shuurei goes to the capital to obtain approvals for the ambitious project, the Sa province's recently established tranquility is threatened by a pandemic that brings both death and turmoil as it begins to spread among the people. Counting on Eigetsu to monitor the situation until her return, Shuurei seeks support from her allies to find a suitable treatment. Yet, Eigetsu's past personal conflicts distract him, providing an opportunity for opponents of Shuurei's position to take advantage of the troubles and undermine her authority. Becoming a government official has been Shuurei's lifelong dream, but it is no easy task for the first woman undertaking such a position. Will she step up and overcome this great challenge or give in to the looming adversities?

An adaptation of the visual-novel by Key, Planetarian: Hoshi no Hito combines the story of the original work with an expansion that extends the narrative with content from the Hoshi no Hito light-novel sequel. In the future after much of the world has been devastated by nuclear and biological warfare, a young scavenger or "Junker" exploring a quarantined and abandoned city comes across a service robot still faithfully awaiting customers in the rooftop planetarium of a department store. Against his pragmatic instincts he helps the robot repair the planetarium's projector: a decision which will change both their fates.

The student-filled Academy City is at the forefront of scientific advancement and home to the esper development program. The seven "Level 5" espers are the most powerful in Academy City, and ranked third among them is middle schooler Mikoto Misaka, an electricity manipulator known as "The Railgun." When strange incidents begin occurring throughout the city, she finds each crime to be connected to the elusive "Level Upper," a legendary device that allegedly increases the esper level of its user. As the situation escalates, it becomes apparent that there is more to the Level Upper than meets the eye, and that Academy City may be a far more twisted place than the glamorous utopia it appears to be. Toaru Kagaku no Railgun focuses on Mikoto and her friends—and the dangerous situations they find themselves in—as they get caught up in the matter of the Level Upper. As Mikoto says, "There's never a dull moment in this city."