As a collaboration between the Japanese girl group AKB48 and confectionery company Ezaki Glico, she was created and featured in June 2011 as a promotional model for Glico's Ice no Mi ice cream product.

[1] Eguchi was announced as the group's newest member in June 2011.

According to an official profile she was 16 years old, born on February 11, 1995, and from Saitama, north of Tokyo.

She was featured in the Japanese magazine Weekly Playboy, and appeared in a television commercial for the confectionery company, Ezaki Glico.

[4][5] Yukari Sasaki, the member who voiced (and in concerts, portrayed) Eguchi, also eventually departed from the group in early 2024.