When magical girls have spare moments, a soothing soak in a hot spring tops their list of leisure activities. Yet the perils that confront four of them at these baths diverge sharply from the usual foes they battle. While one girl keeps her true identity concealed, the sudden arrival of their disreputable elder kin adds extra pressure to what should have been a peaceful escape. The tension threatens to unravel their camaraderie, turning a simple relaxation into a test of trust and secrecy.