[Tsuwabuki]

Digital. If you want to be more amazed, I really, really suggest you watch Hoshi no Koe, 星の声 (Voices of a Distant Star), which initially was animated entirely by Shinkai. He did the male voice, and his wife did the female voice. It was later cleaned up and professional voice actors used after it won a number of awards.

I like all of Shinkai's works, and I love 5センチ but not near as much as I love Hoshi no Koe.