At a certain shrine, a unique ritual was conducted, gathering shrine maidens and engaging in sexual acts under the guise of training. Among them, new shrine maidens "Noa" and "Mikako" were still inexperienced in mindset and conduct, receiving strict guidance from senior maidens "Rena" and "Mihina." Upon learning of their shortcomings, the head priest decided to initiate a new ritual—one that would test their hearts as shrine maidens and ensure the shrine's survival, a severe yet profound ceremony.