Taru is happy, his mother died but he can't blame himself for that, maybe it was ment to happen? And he have found his dad and a cute girl, it can't be better than that! He thinks over his problems and is happy again while he looks at the sunset.
You're familiar with the music? It's from my favourite movie, it's called ''Nausicaä of the valley of the winds'' and it's made by Hayao Miyatzaki. His movies are AWESOME! :D