[Taken from AnimeNfo.com]
Shitou Haruka -- a 29 year old lady who lost her life with her beloved in a flash. She tries to retrieve "something" that was important to her, and joins the special institution TERRA. Haruka's target was Kamina Ayato. He was a high school student 12 years younger than her. However, that Ayato was the person she had feelings for when she parted with him in Junior High.
Lovers parted by the time, a Sci-Fi setting and the test for the truth of people's hearts. The movie heats up with Ayato's RahXephon and the battle with the Dolems. If Ayato awakens completely, the world will turn into a horrific situation. To prevent that, Haruka needs to kill Ayato. Would Haruka be able to go pass this decision? And the "sleeping beauty" that is waiting for Ayato's kiss. How would their love change?
*** thanks to Kyou S for description and translation ***