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The Book of Ruin, which should have been sealed, is released along with the mysterious immortal swordsman, Bacht. Darkness overflows from the book, causing the real world and Wonder World to disappear. Touma Kamiyama, alongside members of the Sword of Logos, challenge Bacht to a decisive battle in order to stop this situation.

A family has owned a soy sauce company for hundreds of years. Parents in the current generation family only have daughters. To inherit their company "Bull Soy Sauce" the fourth daughter is raised as a boy and eventually disguises herself as a man.