The film-within-a-film flashbacks are from Chiyoko's previous livesReincarnation means super effective Enforced Method Acting. The IN SPACE! sequence is a flash-forward memory from her next life.
Chiyoko is a metaphor for JapanThe movies Chiyoko stars in correspond to each period of Japanese history in almost exact chronological order. It's almost impossible that a big name actress like her would pull that off in real life. She dedicates her life to the Serious Business pursuit of...something that she herself isn't quite sure what it is. Is it The Power of Love? Is it the chase? Is it being true to herself or Becoming the Mask? And her last name is Fujiwara, which is about the most What Do You Mean, It's Not Symbolic? last name you could give a Japanese person. (Yamato is more symbolic, but it isn't a real Japanese last name.)
The man with the key is Todd in the ShadowsWe never quite see his face...