Makise invents a method for sending memories back in time, but seems strangely reluctant to go forward with it. And Okabe gets another disturbing message...

All the anime is gone from Akihabara! The single message Feyris sent changed the entire city. Okabe wonders if he should ever use the D-Mail again. And Suzuha's getting ready to leave...

The IBN5100 is gone, and nobody else can remember it ever being brought to the lab! Ruka says that she remembers it being brought to Yanabayashi Shrine, but can't remember when it disappeared. Okabe turns to Feyris for help, but she wants to use the D-Mail in exchange, and she won't tell anybody what she's sending...

Moeka and Ruka ask to use the time machine. Moeka wants to stop herself from buying a new cellphone, and Ruka... wants to become a girl!?

The Lab experiments with a lottery ticket to see if they can change the past. They succeed, but for some reason only Okabe remembers the experiment...

The Lab members decide to develop a time machine ahead of SERN. They discover a method of reliably sending messages to the past, which they call "D-Mail".

Kurisu and Okabe return the IBN5100 to the Future Gadget Lab, where they find Suzuha. Suzuha panics when she sees Kurisu, but why?

The lab members uncover the shocking truth about SERN's experiments, and hints of a deeper conspiracy. Okabe goes in search of the IBN5100, a retro-PC that could reveal more of the conspiracy. And Makise finds herself drawn back to the Future Gadget Lab for reasons having to do with her past...

Makise Kurisu was stabbed by an unknown assailant during Doctor Nakabachi's lecture at the Radio Building. But Okabe sees her alive and well, giving a seminar at the ATF, like nothing had ever happened. Okabe is shocked by this incomprehensible event, but it's not the only strange thing that's happened...

Founder of an inventors group in Akihabara, the Future Gadget Lab (AKA The Lab), Okabe Rintarou, goes with another member of the group, his childhood friend Shiina Mayuri to a press conference held by Doctor Nakabachi at the Radio building. Okabe objects to the doctor's theories of time travel, but a girl appears and drags him away...