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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 it 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 comes round to see the IBN 5100 and, after hearing about the time experiments, is made a lab member.

As Rintarō and Kurisu arrive home with the IBN 5100, Suzuha seems to be shocked when she sees Kurisu. As Rintarō gathers some needed parts, he runs into Suzuha again, who warns her to be cautious of Kurisu and acts strangely when a helicopter passes by. After Hashida gets the IBN 5100 working, he, Rintarō and Kurisu begin deciphering SERN's reports. They discover that they had indeed been experimenting with time travel, with their attempts of sending humans back in time resulting in the same jellification Rintarō had performed on the bananas. With this knowledge, Rintarō becomes determined to perfect his Mobile Microwave.

With further information encrypted in a code that Hashida can't decifer, Rintarō learns from John Titor that he needs the IBN 5100 computer Moeka was looking for to decode it. Whilst doing his laundry, Rintarō runs into Kurisu, who is still in denial about a time machine existing. After Mayuri hears from her co-worker, Feiris Nyannyan, that she knows about the IBN-5100, Rintarō plays a game before learning that the computer is at the shrine where Ruka works. After getting permission to borrow it from Ruka's father, Rintarō and Kurisu carry it back to the lab.

Rintarō agrees to let Kurisu look at the mobile microwave on the condition she become a lab member. They discover that Hashida was using the microwave at the time Rintarō sent his text about Kurisu's stabbing. Despite the microwave causing a large electrical discharge when Mayuri opens it in the middle of operating, Rintarō concludes that the mobile microwave is, in fact, a time machine. After hearing about the large hadron collider and micro-black-holes, Rintarō asks Hashida to hack into CERN's network. There, they discover they had already been performing micro-black-hole experiments, kept hidden from the public, which reveals that humans had died during them.

Rintarō is surprised that Kurisu is alive, before being humiliated by her during a lecture concerning time travel. After getting some provisions from crossdresser Ruka Urushibara and meeting Suzuha Amane, who gets hired to work part time in the electronic's shop below his apartment, Rintarō investigates the supposedly altered events and learns of a man calling himself John Titor who claims to be a time traveller. Rintarō then discovers the books he had on John Titor had disappeared as if they never existed. The next day, Rintarō encounters a strange woman named Moeka Kiryū who asks for information on a retro PC, which Rintarō gathers from Hashida. Later, whilst testing a banana on their microwave which then disappears, Rintarō and Hashida find the banana reattached to the bunch it came from in its gelled state, before Kurisu appears before them once again.

Self-proclaimed mad scientist, Rintarō Okabe, goes to a seminar on time travel with his friend, Mayuri Shiina. Whilst there, he meets a girl named Kurisu Makise who explicitly states that he had met her 15 minutes ago, despite having never met her before. Later on, Rintarō hears a scream and discovers Kurisu had been stabbed. As he sends a text to another one of his research buddies, Hashida Itaru, Rintarō experiences a strange experience and finds the street he is on has suddenly become deserted and a strange sattelite had crashed into the building he was just in. Later on, whilst fiddling about with their strange remote-controlled microwave, which turns bananas into a gel-like substance, Hashida tells Rintarō that the seminar he supposedly attended was cancelled, much to his surprise. Rintarō later discovers that the text he sent to Hashida had been sent to a week ago, just before encountering Kurisu, who is alive and well.

The inconceivably powerful Lord Boros has traveled untold distances in search of someone who can cure his boredom: Saitama! With the fate of humanity in the balance, will the two champions at last find in each other the worthy opponent they've been searching for?

As a colossal spaceship floats in the skies above City A, a member of its monstrous crew battles on the ground against a group of S Class heroes. Despite their powers, they can't seem to finish it off. Meanwhile, Saitama has boarded the enemy ship on his own.

Saitama tags along to an emergency meeting of Class S heroes and discovers that a seer has foretold a serious danger threatening the Earth. Though the crisis could occur anytime in the next six months, the heroes are surprised to hear the roar of explosions that very hour!

As the battle with the Deep Sea King reaches its climax, more heroes fall to the aquatic despot's brutal attacks. Which of them has what it takes to be a true hero?