Purple Moon ga Kagayaku Yoru ni

A mysterious stranger warns Yuu, a high school girl, about an impending Purple Moon that occurs every 100 years and brings a miracle. The warning comes as she is heading to visit her long-distance boyfriend. Soon after, Yuu finds herself in an extraordinary situation that prevents her from returning home. Her boyfriend, Ryouya, kindly invites her to stay with him until things return to normal. Yuu hopes that everything will eventually go back to the way it was.