Eccentric scientist Rintarou Okabe has a never-ending thirst for scientific exploration. Together with his ditzy but well-meaning friend Mayuri Shiina and his roommate Itaru Hashida, Okabe founds the Future Gadget Laboratory in the hopes of creating technological innovations that baffle the human psyche. Despite claims of grandeur, the only notable gadget the trio have created is a microwave that has the mystifying power to turn bananas into green goo. However, when Okabe attends a conference on time travel, he experiences a series of strange events that lead him to believe that there is more to the Phone Microwave gadget than meets the eye. Apparently able to send text messages into the past using the microwave, Okabe dabbles further with the time machine, attracting the ire and attention of the mysterious organization SERN. Due to the novel discovery, Okabe and his friends find themselves in an ever-present danger. As he works to mitigate the damage his invention has caused to the timeline, Okabe fights a battle to not only save his loved ones but also to preserve his degrading sanity.

After dying a laughable and pathetic death on his way back from buying a game, high school student and recluse Kazuma Satou finds himself sitting before a beautiful but obnoxious goddess named Aqua. She provides the NEET with two options: continue on to heaven or reincarnate in every gamer's dream—a real fantasy world! Choosing to start a new life, Kazuma is quickly tasked with defeating a Demon King who is terrorizing villages. But before he goes, he can choose one item of any kind to aid him in his quest, and the future hero selects Aqua. But Kazuma has made a grave mistake—Aqua is completely useless! Unfortunately, their troubles don't end here; it turns out that living in such a world is far different from how it plays out in a game. Instead of going on a thrilling adventure, the duo must first work to pay for their living expenses. Indeed, their misfortunes have only just begun!

Death is one of many mysteries that has left humanity in the dark since the dawn of time. However, the burning question of what happens to the soul after one dies is soon answered to 17-year-old Yuzuru Otonashi. Waking up with no previous memories in a dimension between life and death, he discovers the unsettling truth of the afterlife. Taking the form of a high school, this bizarre dimension is designated to shelter those who died unwanted deaths. Feeling wronged by God during their earthly lives, the school's residents have decided to form the Afterlife Battlefront—a rebellious faction determined to oppose their god-like student council president, Kanade Angel Tachibana. The group's leader, Yuri Nakamura, recruits Otonashi in their fight against Angel in order to take control of their own lives. However, questioning the morality behind their actions, Otonashi takes a step behind the enemy lines to understand the opposing side of their common fate.

The rare and inexplicable Puberty Syndrome is thought of as a myth. It is a rare disease which only affects teenagers, and its symptoms are so supernatural that hardly anyone recognizes it as a legitimate occurrence. However, high school student Sakuta Azusagawa knows from personal experience that it is very much real, and happens to be quite prevalent in his school. Mai Sakurajima is a third-year high school student who gained fame in her youth as a child actress, but recently halted her promising career for reasons unknown to the public. With an air of unapproachability, she is well known throughout the school, but none dare interact with her—that is until Sakuta sees her wandering the library in a bunny girl costume. Despite the getup, no one seems to notice her, and after confronting her, he realizes that she is another victim of Puberty Syndrome. As Sakuta tries to help Mai through her predicament, his actions bring him into contact with more girls afflicted with the elusive disease.