Yuuri Wakasa, also known as 'Yuu' or 'Rii-san,' is a key character in the anime series "Gakkou Gurashi!" She is a high school student and a member of the School Living Club, a group of students who continue to live at their school following a zombie apocalypse. As the club's president, Yuuri is responsible for maintaining order and morale among the group. Her compassionate and nurturing nature, paired with her leadership skills, make her a central figure in the club's survival efforts. Yuuri struggles with the emotional burden of leadership but remains determined to protect her friends.