Some one say that Shidou have Kotori flame and that's why he survive when he shield Tohka from that shot in vol 1.But why he have the flame? it's something that Kotori give him before the story start ? or it's something that kotori can do when there is the need? No,because now i'm confuse..i remember some one say that Kotory point out that not matter if there is a game over(Shidou die or really hurt) because she can start the game again. But
She seem pretty worry here. Like she really think he was die for good or at the very last seriously hurt(maybe before the hug). So how this flame even work? I mean if this was explain.

It's not that Shidou got Kotori's flame. Kotori just use her fire to revive Shidou when he died. And to answer your second question, Shidou was hurt in the illustration from entering Yoshino's bounded field, and Kotori is not sure if her power can reach Shidou in the field. Furthermore, inside the bounded field, Shidou's body was pierced over and over again and he didn't die instantly like in vol 1. that's why she was worried about him in vol 2 and not in vol 1.

As for how the flame works, it basically burns all of Shidou body after he died and the ressurect him, just like phoenix' fire. Of course there's some limitation, but up till vol 2, all we know is just the power might not work inside some boundaries, possibly one created by spirits.

Nope, he gets ressurected again in vol 2.

Now it's clear the whole flame thing.And I can't blame her to react like this in that pic.

Mind you this is just my guess. But we know Kotori power got seal in vol 4. So there is the chance that she can't do this anymore.

- originally not a spirit, but was given power to control fire by someone 5 years before by someone who also sealed her memory regarding the incident.
- strongest spirit to date, but the more she use her power the more she lose control of herself as a human.
- caused shidou to suffer heavy injury back when her power run out of control 5 years earlier
- the flame that heas Shidou is actually her spirit armor power.
- supposed to be completely sealed 5years ago, but remember that there's a power connection between Shidou and the spirit he saved and the power might flow back to them if they're agitated.
- retained full power in end of vol 3 and her body become the same as spirit in vol 4
- resealed at the end of vol 4

So Shidou seal it's not absolute and Kotori it's not a full spirit at least at the beginning. So in vol 3 she regain her full power and she become like a full spirit.

- Was killed over and over again by Mana, Shidou's real sister.
- Her power is to control time, which is why she is still alright even after Mana "killed her"(she turn back time to before she got hurt)
- Unlike the other spirit, she willingly cause space time quake to kill people
- Her ultimate goal is to return 30 years to the past and kill the very first spirit to make all spirit disappear from the world
- To achieve that, she plan to absorb the spirit power of Touka, Yoshino, and maybe Kotori now from inside Shidou(since she seems to failed when trying to use her skill to return 30 years in the past)
- Her angel is destroyed by Kotori at the beginning of volume 4
- In the epilogue of vol 4, she hasn't fully recovered her ability, but still plan to suck the spirit power from Shidou(this is the picture at the end of volume, so basically she only appear in early chapter to be beaten by Kotori, and at the epilogue for foreshadowing)
- Seems like there's another spirit(or maybe human, identity still being hidden) that thinks her action is actually quite kind, probably the same unknown entity that tells Shidou to seals Kotori power 5 years before and give Kotori her fire spirit power

If this happen from what i understand will mean no more Touka, Yoshino and maybe Kotori as well. I don't know you but i read this line like....first spirit die= this girls never born /exist.

existed outside the world before the first one opened the gate. The first spirit dies, they never get dragged into the human world in the first place. It was stated in the first volume (the only one I've read) that Tohka did not wish to come and every time she appeared she was attacked. While she eventually fell for Shidou and so did the others, they went through hell first, and Shidou is a harem protagonist. He'd be willing to lose his own happiness to save the girls from all that pain.

i remember that part. But i really get the feeling that kill the first one would mean this o.o Also....i don't think the girls would be happy about this.I mean no be able to be with him anymore.

Putting everything in spoiler tags is annoying....

Well, there's no point in arguing about the result until the trans gets that far, but I really don't see how that would work.

About the girls, they wouldn't remember him. That's the really scary part that makes this possible. If Shidou becomes convinced this is for the best, and willingly gives his power to Kurumi, she'd erase everything that happened. He'd never have met any of the spirits, or even Origami for that matter. Hell, for all we know, getting absorbed by Kurumi could wipe him from existence entirely. One of those dumb "Forgotten Hero" tragedy endings.