Set in the same timeline as Sin: Nanatsu no Taizai, Nanatsu no Bitoku follows a group of angels sent from Heaven to look for a potential "Savior" to counter-attack the demonic influence being spread by Lucifer and the other emissaries of Hell.

Unaired episodes included with the Blu-ray and DVD release of Nanatsu no Bitoku.

Unaired episodes included with the Blu-ray and DVD release of Nanatsu no Bitoku.

In the world of magic, there exist deadly irreversible techniques commonly known as spellblades. These sparse and elusive spells, along with their casters, are shrouded in mystery and only their absolute lethality is known to the masses. Every year, the spring blossom signifies a new intake of students to the prestigious magic school Kimberly. With reactions of awe and bewilderment, a ceremonious parade complete with magical beasts welcomes the newcomers to the institution. Among them is the mysterious Oliver Horn, whose indifference changes to fascination as he notices a peculiar figure—a girl wearing strange attire equipped with a Japanese sword. From the entrance ceremony onward, Oliver realizes that not all is as it seems at Kimberly, as the emergence of labyrinths, monsters, and other threats endanger the new student body. Nanatsu no Maken ga Shihai suru explores the intertwined fates of two warriors as they uncover the dark truths that lurk within the walls of the academy.

In the world of magic, there exist deadly irreversible techniques commonly known as spellblades. These sparse and elusive spells, along with their casters, are shrouded in mystery and only their absolute lethality is known to the masses. Every year, the spring blossom signifies a new intake of students to the prestigious magic school Kimberly. With reactions of awe and bewilderment, a ceremonious parade complete with magical beasts welcomes the newcomers to the institution. Among them is the mysterious Oliver Horn, whose indifference changes to fascination as he notices a peculiar figure—a girl wearing strange attire equipped with a Japanese sword. From the entrance ceremony onward, Oliver realizes that not all is as it seems at Kimberly, as the emergence of labyrinths, monsters, and other threats endanger the new student body. Nanatsu no Maken ga Shihai suru explores the intertwined fates of two warriors as they uncover the dark truths that lurk within the walls of the academy.

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.

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The Seven Deadly Sins travel to a remote land in search of the phantom ingredient "sky fish." Meliodas and Hawk end up at a "Sky Palace" that exists above the clouds, where all the residents have wings. Meliodas is mistaken for a boy who committed a crime and is thrown in prison. Meanwhile, the residents are preparing a ceremony for defense against a ferocious beast that awakens once every 3,000 years. But the Six Knights of Black, a Demon Clan army, arrives and removes the seal on the beast in order to threaten the lives of the residents of Sky Palace. Meliodas and his allies meet the Six Knights of Black in battle.

In search of a mystical ingredient known as Sky Fish, Meliodas and Hawk stumble upon a spring that suddenly transports them to the Sky Temple: a breathtaking land above the clouds, inhabited by beings called Celestials. Meliodas, however, looks strikingly similar to a local criminal called Solaad, and is imprisoned and shunned as a result. Meanwhile, the kingdom of the Sky Temple prepares to defend the Great Oshiro's seal—said to harbour a three thousand-year-old evil—from the malevolent Six Knights of Black, a group of demons who seek to destroy the seal. However, the Demon Clan is successfully unleashed and terrorizes the land, prompting the remaining Seven Deadly Sins and the Celestials to fight against their wicked foes. The battle progresses well, until one of the Six Knights awakens an "Indura of Retribution," an uncontrollable beast from the Demon Realm. With its overwhelming strength and sinister power, the Seven Deadly Sins and Celestial beings must now work together to defeat the creature that threatens their very existence.

OVA bundled with the 15th and 16th volume of the manga. 15th volume DVD will feature the sin of greed as the central character. 16th volume DVD will feature side stories of the main characters in omnibus format. Episode 3 is Nanatsu no Taizai: Eiyuu-tachi wa Hashagu

Tristan, the son of Meliodas and Elizabeth, inherits the power of the Goddess Clan and can heal people's wounds and injuries, but he often ends up hurting others due to his inability to control his Demon Clan power. To protect his family, Tristan heads to Edinburgh Castle and meets a host of new friends along the way.