Hey, at least we kept our theories to this thread instead of spreading them around like bad fanfiction. OOH OOH I CAN DO THIS TOO
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Movie starts out with flashbacks. Naruto gives a recap of the manga series, briefly remembers his parents and how they sacrificed themselves for him, etc.
Jumps to a winter festival. Sakura is there in a kimono and Naruto explains (as narrator) how he's loved her for a long time, but she loved his best friend, so he never had the courage to confess. He briefly touches on others there at the festival - Hinata and Hanabi, the rest of the rookie crew, etc.
They are attacked at the festival. Hinabi is kidnapped by Toneri. Naruto tries to stop him, but Toneri steals his sage powers.
Team 7 + Hinata go to rescue her.
They end up on an island with an abandoned city. Naruto and Hinata are separated from the rest of the group. Things get kind of dream like; Naruto starts remembering things that didn't happen in the manga, scenes with Hinata. They get closer and things get mushy.
IN REALITY - it was Hinata who was kidnapped. Team 7 is doing their best to rescue her while the moon threatens to crash down on their heads. They find Toneri and Hinata about to have some kind of wedding ceremony; Hinata is fully convinced she is marrying Naruto and envisions the wonderful family they are going to have in the future.
Team 7 et al break the spell, rescue the princess, etc.
Naruto has a very painful and uncomfortable moment in which he gives a formal rejection to Hinata. He wasn't able to answer her feelings all along. Broken hearted but resolute, Hinata vows to be a good clan leader instead of continuing to pine after Naruto.
Having to reject Hinata gives Naruto the courage to finally make a formal confession to Sakura under a cherry tree, who proceeds to whack him over the head and ask him what took so long.