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I'm beginning to think this initial theory of mine is more likely, now thinking back more and getting other speculation and theories from people I'm friends with. Listed below in spoilers. [mod edit: spoiler tags not needed for speculation]

The part-time soldier said she was a SERN-spy and could possibly be well true, and even to the extent that her own father is in SERN. Since Kurisu wants to make up to her father and get along with him once again, she was willing to plot against her friends in order to achieve this. So she constantly leaked information about what they are doing, and indulged herself in experimenting to make sure things go well. She could have possibly even forwarded the hacking of SERN herself

She had so much fun while she was young debating against her father to the point where she was starting to win against him. After idolizing him and him being the very reason why she started to love science, she might be feeling incredibly guilty that she even got her father mad at her in the first place and making it feel more like a "competition" then your friendly father-daughter debate. So she might be at the point where she will go to extreme lengths just to bring that fondship between them back. She also constantly brings the topic back up from time to time.

Just came up with a crazy theory that will explain Okarin's screams during Kurisu's murder back in episode one... and for the nonsense following, thank the DDoS attack that I had to deal with today at work :/

So it is more or less fate (i.e. divergence factor) that leads to Mayuri's death, so the only way to avoid this is for Kurisu never to meet Okarin, and lead to the series of events, that stop Mayuri from being Okarin's hostage, as well as getting the SERN involved, contacting Titor, etc. So at some point the only option for Okarin to save Mayuri is for him to kill Kurisu :eyespin:

Now, however feasible or plausible it is, I do not believe (or rather hope) that it will come true, because Okarin will be a very sad panda :p

@Eclair: So here is the explaination for your original theory ;) Let's see who will win, your tsundere or my moeblob... since my Feyris is not appearing any more :/

Hm.

I can see where you're coming from with the theory, but I don't think it'll be true in the long run. Kurisu may want to reconnect with her father, but something the show establishes very well is that she was also extremely lonely/distant from other people up until she got dragged into Okabe's lab and became friends with the members there. It seems OOC to me for her to trade away her friendships with the others just to try and connect with her father again, especially since even when she talks about wanting to be close to her father like she was as a child, it's usually in the way of someone resigned to the fact that it won't ever change.

Though, I do think at some point, Kurisu will have to choose between keeping her friendship with Okabe/saving Mayuri and regaining her lost bond with her father, especially if he's tied to SERN. He might promise to be close to her again if she sells out her friends, which leads to a moral dilemma.

Greertings everyone !

There is one thing I don't understand : in the first episode, Kurisu is killed but when Okabe sent a mail, the line changed and she was saved. In exchange, that time machine landed in the building and John Titor never went in the year 2000.

My question is : Why is the death of Kurisu change the date of visit of Titor ? In the first place, Okabe sent the mail to Daru who doesn't know Kurisu in person so I could not tell her "you are dead" so how did he change that fact ? And what the connection to Titor ?

Saving Kurisu, it's speculated, back in episode one is what caused Okabe to cross the 1% barrier and to switch the timeline he was originally in over to the Alpha timeline they've been in ever since.

That I understood but why ? To cross the 1% barrier the event changed must be of great importance ... why is Kurisu important ?

And how an e-mail sent to a nobody (daru) could save her in the first place since they didn't know each other before that ?

Perhaps just as Mayuri is destined to die in the Alpha timeline and trigger SERN's dystopia in the future, in the original timeline Kurisu was destined to die and trigger something first?

The reason must be connected to Titor since in the original timeline he went in 2000 and in the alpha timeline he went in 2010. The question is : what is it ?

Maybe Okabe is the reason behind Mayuri's death?

Okabe tried to not approach Mayuri but did he check afterward if she was still alive ?

And what is Titor searching in 2010 ? It must be something findable in 2000 too....

A possibility. Considering that, from what we know, Mayuri's life wasn't threatened in any way until Okabe and the others hacked into SERN and picked up their D-mail experiments, it's possible that in doing that, he destined her to die. Question is now, how does he fix it?

By not doing a time machine ? But we know that's impossible : it's fixed event, just like Mayuri's death.

Mayuri's death is a fixed event in the Alpha timeline; we currently don't know if it was a fixed event in the original timeline, where Okarin found Kurisu dead. It's possible that if he reverted things back to the original timeline, he could save Mayuri.

That could be a possibility RadiantBeam ;) But how would he revert things back to the original timeline? Only thing I can come up with is involving the D-mails again which could make things even worse..

Well, apparently the timeline shifted more and more with each D-mail the group sent, up until the point we see now where Mayuri is now doomed to die. Perhaps finding some way to undo the effects the D-mails had on the timeline is the key?

From episode 15, we find out her real mission is to go back to 1975. The 2010 stop was simply to look for her father.

Now, this is actually kind of interesting. Because we know Suzahu, prior to that first D-Mail Okarin sent, went back to 2000, not 2010. It's also heavily implied in this particular time, that she's searching in 2010 because that's what year is on the badge she carries. Did the Suzahu prior to Okarin's first D-Mail carry a badge from 2000 instead? Or is this all moot, and simply a random bit of info to illustrate that sending D-Mails can have unintended butterfly effects and has no real bearing on the story itself? Beats me.

Actually I was wondering... in the first timeline in Episode 13, when Okabe ran to the time machine to use it, Kurisu was shot by Moeka. If it's true that all deaths are final unless you shift to a different time trunk altogether, how come Kurisu, unlike Mayuri, doesn't die every time?

^The simplest explanation is that the gunshot wound she received may not have been fatal.

Not really... definitely not the case, since Kurisu and Suzuha have died in some but survived in other timelines of the same trunk.

Mayushii's death is the end result of a web of events starting way earlier, probably even related to Okarin's childhood, since he hinted that he had a similar sensation to time-shifting, when he was a child.

Kurisu's death, is not as important (in the general scheme of things) after completing the time-traveling machine prototype.