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The story revolves around Rin Okumura, a teenager possessing abnormal strength and endurance who, along with his younger twin brother Yukio, was raised by Father Shiro Fujimoto. Soon after Yukio departs to study at the prestigious True Cross Academy, Rin learns that he is the son of Satan, the strongest of all demons. Witnessing Shiro dying to protect him, Rin ends up doing what his guardian asked him never to do: draw the demon-slaying blade Kurikara, which restrains his demonic powers, from its scabbard. From that moment on, Rin not only gains permanent demonic features like fangs, pointed ears, fiery "horns" and a tail, but also the power to ignite himself into blue flames that can destroy almost anything they touch.

Hellsing, a secret organization within the British government, has long been battling supernatural threats to keep people safe from creatures of the night. They have a secret weapon in the form of an incredibly powerful vampire Alucard. Alucard serves whoever is the Hellsing organization's current master, a position currently held by Sir Integra Wingates Hellsing. Sir Hellsing, stylized as "Sir" while female, commands respect within Hellsing, England, and the world - leading Alucard to crush a resurgent Nazi assault.

Kageyama Shigeo (a.k.a. "Mob") is a 8th grader with psychic abilities. He could bend spoons and lift objects with his mind from a young age, but he slowly began to withhold from using his abilities in public due to the negative attention he kept receiving. Now, the only thing he wants is to become friends with a girl in his class, Tsubomi. With his psychic "mentor" (who has no psychic powers), he continues his daily life, attempting to realize his purpose in life.

Aster and Yuno were abandoned together at the same church, and have been inseparable since. As children, they promised that they would compete against each other to see who would become the next sorcerous emperor. However, as they grew up, some differences between them became plain. Yuno was a genius with magic, with amazing power and control, while Aster could not use magic at all, and tried to make up for his lack by training physically. When they received their grimoires at age 15, Yuno got a spectacular book with a four-leaf-clover (most people receive a three-leaf-clover), while Aster received nothing at all. However, when Yuno was threatened, the truth about Aster's power was revealed-- he received a five-leaf-clover grimoire, a 'black clover' book of anti-magic. Now the two friends are heading out in the world, both seeking the same goal!

The "Seven Deadly Sins," a group of evil knights who conspired to overthrow the kingdom of Britannia, were said to have been eradicated by the Holy Knights, although some claim that they still live. Ten years later, the Holy Knights have staged a Coup d'état and assassinated the king, becoming the new, tyrannical rulers of the kingdom. Elizabeth, the king's only daughter, sets out on a journey to find the "Seven Deadly Sins," and to enlist their help in taking back the kingdom.