The Triology Interpretation

[Raleigh]

I've heard so much about Hikaru Utada's triology and I watched them to see the connection. However I must say they're pretty complex and I was wondering if there are some articles with regards to them or someone who would be so kind to write out their interpretation of these stunning clips.

I'm especially interested in the role of Hikki in Sakura Drops as there are no humans there apart from her. Does it reflect human life and their behaviour? It's quite interesting to analyse and I'm really curious with regards to it.