In the summer of 2010, self-proclaimed mad scientist, Rintar? Okabe, goes to Doctor Nakabachi's 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, Rintar? 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 Hashida, Rintar? 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, Itaru tells Rintar? that the seminar he supposedly attended was cancelled, much to his surprise. Rintar? later discovers that the text he sent to Itaru had been sent a week ago, just before encountering Kurisu, who is alive and well.