Hi, I'm looking for a manga where the protagonist doesn't' stop time traveling to save someone he loves.

The manga will be even better if:
-the protogonist is a male (not naive with preference) who doesn't hesitate to kill somebody in order to attain his goal.
- there is a romance between the characters
- the girl/or the boy she/he loves sacrifice herself/himself because she/he is manipulated.
-the protogonist can see ghosts.

Thanks in advance for your replies.

Steins;Gate maybe?
it has a male protagonist, i haven't read it for a while so i'm not sure if there's romance and i don't think there's ghosts in it but in my opinion, it's a good time travel manga overall.

[img]http://30.media.tumblr.com/tumblr_loz34q6G3s1qfy2kdo3_250.gif[/img][img]http://27.media.tumblr.com/tumblr_loz34q6G3s1qfy2kdo4_250.gif[/img]

Time travel is a part of it but...I don't know. I mean, he pretty much traveled through time to save her at several part of the story. Shinobi Life

"Shouldn't be alive but the condom broke."

Mahou Shoujo Madoka Magica, I suppose.

I second Steins;Gate, it is freaking awesome!!! The whole story fits your criteria perfectly. Recommend watching the anime than reading the manga though. The anime is finished while the manga is behind on its translation. Originally a visual novel, so go play the game!!!

The Threads of Time

The meaning of life...is to give life meaning.

I, too, really love this plot device. However, it seems to be sort of rare. I can only name three examples in the world of anime/manga off the top of my head, those being:

Steins;Gate - already mentioned twice, but it really is that good. Especially if you read the visual novel. The most straightforward example of this trope that I can think of.

Mahou Shoujo Madoka Magica - ...a bit of a spoiler, I guess, but it's pretty obvious if you pay attention. Not the center of the plot from the beginning, but a major aspect.

Higurashi no Naku Koro ni - if I explain anymore about this, it would a huge spoiler. But it's great, really. Fantastic. Don't let the horror theme scare you away, the plot it develops is amazing.

Gyakusou Shoujo - Owaranai Natsuyasumi has no ghosts and there's more than one time traveler, although it wouldn't be entirely accurate to say either of them are motivated by love

Thanks for the tips guys ^^
I already watched the animes of steins;gate and madoka magica. They are truly awsome!
I watched Higurashi no Naku Koro ni too, but with time I found it boring..
Gyakusou Shoujo - Owaranai Natsuyasumi : Never heard about it, gonna read it, thanks ^^