In 2008, the Japanese government began hunting people who identify as otaku in an effort to protect the country's culture. In just one week, the enforcement agency known as the SSC captured almost every otaku by force and confiscated their memorabilia. One passionate man calling himself Otaku Hero refuses to allow this agency to do as they please: he raises a resistance army made up of other displaced geeks who band together to help defend their culture. Three years later, the fires of rebellion wane as all hope seems lost for otakus. Spurred on by his ally—the magical girl Anarchy—Otaku Hero commands the resistance in an effort to reunite Anarchy with the other two other magical girls: Blue and Pink. By combining the power of this trio, the resistance may be able to defeat the SSC and save otaku culture for everyone.

Tang San is one of Tang Sect martial art clan's most prestigious disciples and peerless in the use of hidden weapons. With high expectations, the sect's elders believe his future will be bright; yet Tang chooses to forsake this life at the cost of obtaining the sect's forbidden lore—an action punishable by death. Tang, now content with his ascension of knowledge, sees no reason to keep on living and jumps from Hell's Peak, but little did he know that that would not be the end of his existence. In Douluo Continent, the strong prevail and the weak perish. Each person possesses an innate spirit, some of which can be cultivated and strengthened, bestowing its user with various benefits. Those who were born with such spirits can become Spirit Masters, a profession regarded as one of the continent's most noble. Tang, reincarnated into this strange world, knows only the life of a blacksmith's son. At the age of six, he takes part in the Spirit Master ceremony, and discovers his spirit is Blue Silver Grass—supposedly the world's most useless spirit. In contrast, however, he possesses strong spirit power. Now, aided by the memories of his previous life as well, Tang's future as a Spirit Master is in no way bleak.

While the funeral of the assassinated Prince Edward, who was the first in line to succeed the throne, is being held, the nobles of the Kingdom of Albion discuss topics such as whether the second-in-line Princess Mary or the third-in-line Duke of Arkham, Prince Richard, will succeed the throne, and how the Duke of Normandy will act. The Duke of Arkham asks Princess if she will side with him or the Duke of Normandy. While wishing to change the world so that all people are equal, Princess is shaken by the Duke of Arkham, who is the mastermind behind Edward's assassination. Meanwhile, Ange and Dorothy are given a mission to infiltrate as Mary's maids and investigate the state of the royal family by the Commonwealth's control. Mary is crushed and exhausted due to the pressure of becoming first in line to the throne. As chaos surrounds the succession to the throne, the Duke of Arkham's plot finally begins to unfold. The darkness writhing in the Kingdom of Albion begins to swallow up Team White Pigeon.

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.