Later, Okabe is reluctantly out shopping for food for the sleepover while Kurisu and Mayuri are back at the lab. Realizing what he has done, he lets out an agonizing cry and this is the scream Okabe hears three weeks prior (at the very beginning of the game). She then tells everyone to get in the car, but after Okabe asks for a taxi instead, Kurisu drives off. After a few awkward moments of silence, Okabe glances at Kurisu and starts to head for the car, when Kurisu asks him to come inside to discuss something. She then tosses the lab coat onto Okabe, saying that no one wants to see a mad scientist with pudding for a brain; of course, Okabe puts the coat on, and discovers to his chagrin that Kurisu used the pink thread. They head to the park, where Kurisu mentions how she and her father are not on the best of terms. She also gives him a phrase to tell her past-self to convince her that Okabe is indeed from the future.

Although Rintarou couldn't think of what to do for Kurisu at that moment, he tells her that he can listen to her sorrows anytime as someone important to him.

He plans to continue with the project using the Phone Microwave (temporary name) in creating a machine that surpasses that of SERN.

As they prepare to delete it, Okabe clutches his head. Okabe suggests that Kurisu should send the next D-mail, but she refuses. She now fears her father will react negatively to her making the machine, but will proceed out of interest. Despite Okabe's dismay, he agrees in order for Ruka not to cry. Then there was a downpour, causing them to both get soaking wet. He then begins following Kurisu to the press conference (the other encounter proving why Kurisu thought she met Okabe 15 minutes earlier), having been tasked to not alter Kurisu's path by Suzuha or risk making the world line worse. Okabe finds himself in the position he was in after introducing his lab members. After some time, Okabe says that he could never forget about her, the person he cares for more than anyone, even if he tried, and proceeds to confess love to her, much to her surprise. Suzuha asks "Uncle" Okabe to help her go back in time again and prevent World War III. Okabe also sees that her envelope contains papers about time machines, and wonders if that is why she was killed.
Going along with their plan, Okabe declares the lab members that they will not experiment with the Time Leap Machine. To give them more time to figure out a solution, Kurisu sends Okabe back about 5 hours into the past.

Okabe time-leaped again.

Once "recruited" into the Future Gadgets laboratory, Okabe gave her Daru's white lab coats that he never uses and is often seen wearing one while in-lab. Faris, now back to her previous May Queen self, appears behind him. After Mr. Braun's suicide and at Kurisu's persuasion, Okabe prepares a D-mail from Mr. Braun's phone telling Moeka to stop pursuing the IBN 5100 at all, and sends it. The next day Mr. Braun gives the IBN to a man in a van, who takes it onto a plane bound for France, meaning he is taking it to SERN. Okabe notes that he, according to John Titor, possibly has the ability to keep his memories as he crosses world lines. The four briefly visit Mr. Braun, Nae, and Moeka.

She then suggests that, since Okabe knows what the text said, he can undo it himself since Ruka wouldn't possibly want to go back to being a boy, but Okabe says that he doesn't know the pager's number and would rather not be so underhanded. Rintarou's first plan in changing the past is… winning the lottery. Surprised, Kurisu realizes that he time-leaped again, and asks what happened, arguing that they are a good team. She then concedes that he cares about people more than he lets on, and that she wants him to remember her every once in a while, even if he kisses someone.
Kurisu then explains that the Butterfly Effect was the explanation for such major changes, and one of the well-recognized risks in changing the past. Okabe is shown standing on the sidewalk, wondering what Kurisu is doing now back in America.

And standing up, Kurisu asks Okabe to close his eyes as with the other world line, finally completing the choice of Steins;Gate...      Just as Okabe is about to concede, Kurisu also mentions that the IBN has to be in the coin locker for a reason: so that FB can come and pick it up, meaning that if Okabe sits outside the locker room and waits, he can see FB. Thinking it's actually her, he follows her in a taxi (driven by the badge salesman), wondering if there is actually time travel in this world line. is the daughter of Shouichi Makise, a genius girl who graduated from university at the age of seventeen, and a member of the Brain Science Institute at Viktor Chondria University and the Future Gadget Lab.

Okabe says he ate it because it didn't say "Christina" just as Mayuri walks in.