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Guts, known as the Black Swordsman, seeks sanctuary from the demonic forces that pursue him and his woman, and also vengeance against the man who branded him as an unholy sacrifice. Aided only by his titanic strength, skill, and sword, Guts must struggle against his bleak destiny, all the while fighting with a rage that might strip him of his humanity.

One day, high school student Akihito Kanbara instinctively goes to save his fellow schoolmate, Mirai Kuriyama from committing suicide. Following his pleas, Mirai suddenly stabs Akihito with a sword formed out of her own blood and is shocked to discover that Akihito is an immortal "half-youmu"—the offspring of a supernatural creature called a youmu and a human.

Yukiteru Amano (or Yuki) is a loner who never really interact with people and prefers writing a diary on his cell phone with his only companion being an imaginary friend named Deus Ex Machina, the God of Time and Space. However, Yuki soon learns that Deus is not a figment of his imagination but real when Deus makes him a participant in a battle royale with eleven others.