Chihiro Enomoto is a new student at Rikkyoin High School, coping with the loss of his parents since childhood. Living with his sister Shinobu, he excels in household chores and cooking. His heart is captured by Tokino, a girl with striking orange hair he encounters in the school library on his first day. Meanwhile, Ritsuko, Chihiro's childhood friend and student council chair, also harbors feelings for him. As the candidates for the upcoming student government positions, determined by a luck-based selection process called kujibiki, engage in a year-long campaign, romantic entanglements and rivalries ensue in their quest for leadership.