Yes manga version.
Go youtube and watch if you can't wait for the d/l, yeah, it's no
longer U.S....

They came out with the Movie Version of Saikano.
http://www.saikano-movie.com/
And a OVA Version titled ~Another Love Story~
http://www.saikano.net/ova/
Review from Amazon :
First off, it's best to mention that this OVA is not a good way to
be introduced to Saikano. Viewers will gain a great deal more if
they have seen the show first.
For only two episodes, a lot more happens in this space of time
than in the rest of the show. Yet this OVA relies on following
events that take place early on in the show. Hence why it's
important to watch the series first.
While the series was mostly told through Shuji's point of view, the
OVA is more 3rd-person, with emphasis on new character Lieutenant
Mizuki and Chise. In fact, Shuji has no major involvement at all,
apart from constantly being on Chise's mind.
This OVA is good in that it explains more. In the series, viewers
don't know really know the "how" or "why" Chise was made into the
ultimate weapon. We get those answers, but once again, the "how" or
"why" isn't as important. Themes of war, being human, and love are
still going strong. We see more of Chise's internal struggle
between her human self and the weapon inside, and how her feelings
for Shuji affect her actions.
New character Mizuki is the perfect foil for Chise. Mizuki is
fiercely dedicated to her role as both a soldier and a weapon. She
is fearless, determined, stubborn, and intelligent. As the
prototype of the weapon that Chise will become, viewers will learn
why Mizuki's ability never equaled or surpassed Chise, and how this
makes her feel and dictates her actions. Mizuki also has
connections to Tetsu, and interactions between them I felt were
important because they shed some light on how Tetsu was with Chise.
Oddly though, this seems to contridict how he felt about his wife,
Fuyumi, who is just barely mentioned. Mizuki, while in a position
to be resentful of Chise, proves to have the potential to be
Chise's friend and confidant, the best hope Chise had of having
someone who understood how she was feeling. Even Shuji had a hard
time grasping this at first in the series.
Mizuki is also a tragic character, as are many characters in the
Saikano canon. And true to Saikano, this short piece is emotionally
driven, heart-wrenching; there's only a glimmer of a happy
ending.
Overall, this OVA could easily fit into the anime series. It's a
nice compliment to it, but seeing it isn't necessary to understand
the actual show. But it's a must for Saikano fans.