In the book "I've Got Your Number" by Sophie Kinsella, the protagonist humorously admits her lack of knowledge regarding Japanese business and culture, humorously noting that her only point of reference is sushi. This quote highlights her feelings of insecurity and unfamiliarity in the context of a business environment that she finds challenging. Her candid acknowledgment of what she does not know reflects a common experience in navigating cross-cultural situations. While sushi symbolizes a small connection to Japanese culture, it underscores a broader theme of exploring new experiences and overcoming personal limitations, resonating with readers who may face similar moments of self-doubt.