In the summer of 2010, self-proclaimed mad scientist, Rintarou Okabe, goes to a seminar on time travel with his friend, Mayuri Shiina. While there, he meets a girl named Kurisu Makise who explicitly states that he had met her 15 minutes ago, despite having never seen her before. Later on, Okabe hears a scream and sees Kurisu lying in a pool of blood. As he sends a text about it to another one of his research buddies, Itaru Daru Hashida, Okabe has a strange experience, finding the street he is on has suddenly become deserted and a strange satellite has crashed into the building he was just in. Later on, while fiddling with their strange remote-controlled microwave oven, which turns bananas into a gel-like substance, Daru tells Okabe that the seminar he supposedly attended was cancelled, much to his surprise. Okabe later discovers that the text he sent to Daru had been sent a week ago, just before encountering Kurisu, who is alive and well. Written by Wikipedia

Okabe is surprised that Kurisu is alive, before being humiliated by her during a lecture concerning time travel. After getting some provisions from cross-dresser Ruka Urushibara, Okabe meets Suzuha Amane, who is hired by his landlord, Yuugo 'Mr. Braun' Tennouji, as a part time assistant in his electronics shop below Okabe's apartment. Later, Okabe investigates the supposedly altered events and learns that a man calling himself John Titor, who claimed in 2000 that he was a time traveler, has surfaced once more in 2010. However, all evidence of Titor's 2000 visit have vanished and, with the exception of Okabe, no one remembers it. The next day, Okabe encounters a strange woman named Moeka Kiryuu who asks for information on a retro PC model called IBN-5100, which Okabe gathers from Itaru. Later, Okabe and Itaru conduct an experiment where a banana placed in their microwave vanishes, only to end up reattached to the bunch it came from in a gelled state. Kurisu visits the lab yet again. Written by Wikipedia

Okabe agrees to let Kurisu look at the mobile microwave on the condition she become a lab member. They discover that Daru was using the microwave at the time Okabe sent his text about Kurisu's stabbing. Okabe concludes that the mobile microwave is, in fact, a time machine which sent his message into the past. After hearing about the large hadron collider and micro-black-holes, Okabe asks Daru to hack into SERN's network. There, they discover SERN had already been performing top secret micro-black-hole experiments, during which humans had died. Written by Wikipedia

With further information about SERN's time travel experiments encrypted in a code that Daru can't decipher, Okabe learns from John Titor that he needs the IBN-5100 computer Moeka was looking for to decode it. Whilst doing his laundry, Okabe runs into Kurisu, who is still in denial about a time machine existing. After Mayuri hears from her maid café co-worker, Rumiho Feiris Nyan Nyan Akiha, that she knows about the IBN-5100, Okabe finds out that the computer is at the shrine where Ruka works. Okabe and Kurisu borrow it from Ruka's father and carry it back to the lab. Written by Wikipedia

As Okabe and Kurisu arrive home with the IBN-5100, Suzuha seems to be shocked when she sees Kurisu. While Okabe gathers some needed parts for the computer, he runs into Suzuha again, who warns him to be cautious of Kurisu. After Daru gets the IBN-5100 working, he, Okabe and Kurisu begin deciphering SERN's reports. They discover that SERN had indeed been conducting human experiments on time travel, succeeding in transporting people to the past but also causing them the jellification Okabe had observed on the bananas. With this knowledge, Okabe becomes determined to perfect his Mobile Microwave. Written by Anonymous

The lab members discuss how to perfect the Mobile Microwave, dubbing messages sent to the past as 'D-Mails'. Further experimenting reveals the various rules concerning D-Mails, being that they can only be sent during a certain time of the day, long messages are split into several smaller mails, and the timer on the microwave determines how far back the message is sent. The next day, Moeka Kiryuu comes round to see the IBN-5100 and, after hearing about the time experiments, is made a lab member. Written by Wikipedia

Okabe takes his experimentation to the next level by texting the winning lotto numbers back in time, but he fails to consider how his actions might alter the present - or the future.

The latest experiment for Okabe and his lab mates leads to the disappearance of one of their own. Next, they'll attempt to use their time travel technology to make a young boy's dream a reality.

Okabe grows concerned over the drastic changes his experimentation is causing, and the IBN-5100 disappears from the lab. The only hope for finding a replacement rests upon the delicate shoulders of Feyris the cat girl.

The part-time warrior from downstairs tells Okabe about the search for her missing father. Meanwhile, the aspiring mad scientist is troubled by a mysterious text message.

As the lab members prepare to transport human memories by way of a Time Leap, Okabe receives some highly disturbing news: Makise may be a SERN spy!

Tension builds at the Lab when Makise and Suzuha both show up for the party, but that's just the beginning. As the night draws to a close, armed thugs - led by a familiar face - come looking for the time machine.

Okabe, desperate to prevent the tragedy he's already seen happen, summons the courage for a daring Time Leap. Can he save the life of his oldest and dearest companion?

Despite his many attempts, Okabe is unable to prevent the death of Mayuri, so he turns to Makise for help solving the riddle of time travel. Later, Suzuha's true identity is revealed

Suzuha reveals the orgins of SERN's future totalitarianism. While she continues her work to destroy the organization, Okabe and Mayuri continue the search for Suzuha's father.

The truth about Suzuha's father is finally revealed. Okabe realizes the devastating consequences of stopping her from leaving the night of the party.

After the change in divergence fails to have a lasting effect, Okabe and Kurisu set out to further manipulate time in the hopes of gaining an IBN 5100.

In a further attempt to rescue Mayuri from her fate, Okabe reveals Ruka's past to her. Ruka must make a difficult decision that might change her entire life.

Okabe must make a time leap in order to save Moeka from herself. He realizes that all is not what it seems as Moeka's shady behavior leads him closer to the IBN 5100.

With the help of Kurisu and Moeka, Okabe attempts to get closer to the IBN 5100 and the mysterious FB. As he closes in on SERN's network, he realizes that the path to victory will not be without additional sacrifice.

With his new discovery in mind, Okabe continues his attempts to protect Mayuri while also trying to avoid Kurisu's potential impending fate.

In order to continue his work against SERN, Okabe must finally choose between saving Kurisu or Mayuri.

Tasked with preventing an impending World War III by an alternate Suzuha, Okabe finds himself playing an active part in Kurisu's death.

Okabe has one final chance to travel back in time, set everything right, and save the girl he never even got to love. His mission is vital, but it may mean the end for the mad scientist.