Ruri is your average preschool teacher, until one day she is enveloped in a blinding light and is transported to another world! While she's still in shock, Lina, a shy young girl, takes her by the hand and becomes attached to her. Before she knows it, she's become her private tutor! Until she can make it back to her world, she decides to accept her role, but she suddenly awakens her exceptional magic skills! In truth, Ruri is the rumored "Third Saint" that has been summoned to save this world! Follow Ruri in this fantastical story as she tries to balance her duty as a Saint when all she wants is to live alongside children!