Yeah, it was pretty obvious.
What with the scenes in the middle I was kind of left feeling like I wanted more. I'd argue that he only kissed Soujyu and told her to keep it a secret from Sara, but I'm pretty sure that's just because of the whole first kiss thing and the fact that he had to get her to leave somehow. The main thing is just that Sara started seeing Kimihiko in a different light in the end, and it seemed like that was left unresolved.
Not saying that I wasn't really satisfied with the anime, it's one of my favorites now.