Very interesting. In a way this movie reminded me of Cyborg Girl. I found a lot more moments where I was yawning of boredom, a usual thing with me and Japanese movies, the same with Korean. The following synopsis is taken from
MySoju.com, where you can find the links to watch the film with subtitles.
Description: Saikano (最終兵器彼女, Saishū Heiki Kanojo?, lit. She, the Ultimate Weapon or My Girlfriend, the Ultimate Weapon) is a manga and anime series by Shin Takahashi, creator of Iihito and Kimi no Kakera. Saikano was originally serialized in Shogakukan's Big Comic Spirits magazine.
A live-action movie adaptation was released in Japan on 28 January 2006 with Aki Maeda starring as Chise.