Shioriko is the second daughter of the prestigious and wealthy Mifune family.
She challenges Setsuna Yuki for the position of student council president by initiating a re-selection because she is dissatisfied with Setsuna's leadership. Shioriko believes that students should do things they can succeed at rather than follow their passions. She states that if she wins, she will disband the Nijigasaki High School Idol Club.
