Maria Himuro, a bullied student at an elite girls' academy, is hiding her true identity as the daughter of the boss of the Himuro Group, a powerful Yakuza organization. After her father is attacked, Maria inherits his position as boss, but she soon gets caught up in a mysterious explosion that sends her back to the Warring States period. There, she meets none other than Oda Nobunaga, who aims to unify the country under his mighty rule.