Final answer:
There is not enough information provided to determine who Keiko Okabe is due to lacking context and reference to unrelated material.
Step-by-step explanation:
The character Keiko Okabe from the text in question appears to be a fictional persona, but the context provided does not offer enough information to accurately determine which role she fulfills in the story. The reference Ohnuki-Tierney, Emiko. 1993. Rice as Self: Japanese Identities through Time. Princeton, NJ: Princeton University Press discusses Japanese identities and cultural concepts rather than individual characters in a fictional work. Without additional details about the specific narrative or text in which Keiko Okabe is a character, it is not possible to give a correct or informative answer regarding her role.