Talented Exorcist won't submit to Tentacle Demon

Since ancient times, there have been dark beings, demons, that harbor grudges against humans. Even in modern times, they still exist. However... there are also those who protect people from these demons. They are called "exorcists" and have been battling demons since ancient times. The current head of the prestigious exorcist family, the Kuranashi (Dark Void) family, is "Kuranashi Mari." One day, Mari rescues a girl named "Aikawa Hiyori" who was attacked by demons. To help Hiyori, who has lost her exorcist powers due to a womb tattoo, Mari dedicates herself to the battle against the demons...