At an elegant social party attended by high-society young ladies, what began as a refined evening gathering gradually transforms into a wild scene of public humiliation and training. This time, the event is set to take place at the mansion of "Kaori Miyanaga"—a rare occurrence—and her younger half-sister and junior, "Maki," is invited under near-coercive circumstances. Maki strongly resents Kaori's scheme, and her growing anger soon triggers unexpected developments.