Keiko Tsuji was born on October 9, 1993 in Okinawa, Japan. From a young age, she enjoyed swimming and karate. She joined the karate club after entering junior high school in 2004 and went on to represent Okinawa in national competitions. Keiko has also served as the captain of her karate club.
In 2010, she entered Nagasaki International University. She majored in nutritional science to learn about the importance of the body and dietary health as well as the wonders of Japanese food. In her first year of college, she ranked first in the Kyushu karate competition. She achieved third in the national competition. Now she is continuing her university studies, while aiming to become Miss Universe.