The protagonist of the first Grisaia series. Ace number 9029, Yuuji is the "janitor" for the underworld. Tired of his usual life, he wants to live a normal school life. Cool, philosophical, and minimalist, Yuuji is a realist (but also a tsundere). Being very cautious, he always plans and scouts before action. Other than his occasional orthodontic military methods, he’s just a fit young man who mostly keeps his thoughts to himself. Usually, he disguises himself as an "exchange student from Canada".