We can see here that Sachiko's experience relates to the theme of identity in the following way: Sachiko sees herself as more mature than her sister as she isn't focused on appearances.
Theme actually refers to the main idea which is seen in a story or poem and which the author is trying to communicate to the readers.
We see here that the theme of identity is seen. in Sachiko's experience as she sees herself as more mature than her sister as she isn't focused on appearances.
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