One day, ordinary high school girl Aira Misono was walking to the convenience store at night when she was summoned to another world in a Saint Summoning Ceremony. Welcomed by Kyle, the first prince of this strange kingdom, she was treated as the Saint that was supposed the save the world from the monsters and miasma that was consuming it. However, rumors began to circulate that another woman who was summoned alongside Aira is the true Saint...