Nobles who possess the ability known as Purification bear the mission of protecting humanity. Risa Tsunohara is a special girl with nothing to her name, attending a school for training people with abilities.
To bring out her talent and verify the theory held by the higher-ups, the legendary nun Tae Yamada is assigned as her personal attendant.
She also has another mission: "If the theory is proven correct, she must eliminate Risa Tsunohara for the sake of humanity."
This book is also known as The Legendary OL Warrior, The Story of How an Invader Became a Fan After Attending a Live Show, FranChouChou Is the Best, FranChouChou Is the GOAT, and Saga Idols Are Legends Forever.
