Three months have passed since the Demon King was defeated by a hero. Mankind rejoices over their victory, but dwellers of the demon world do not share the same sentiment. With the loss of their king, they must now hold a tournament to decide who will become his successor. Monitoring the competition is the hot-headed yet powerful Vamirio—one of the Four Heavenly Kings. Among all the participants, she is extremely distrustful of one: Helck, a human hero who claims to hate humanity. As much as she wants to get rid of him, it is impossible due to Helck's incredible strength and popularity. Amidst the competition, Vamirio discovers that humans have vanished from various towns. As a result of this puzzling turn of events, Vamirio grows desperate to reveal Helck's true intentions by carefully crafting a plan to make Helck lose. If she proves to be successful, she might uncover where his loyalty truly lies before the demon world is endangered.

The fight has moved on to the next stage. A new plan is in motion... A new battle among the strongest warriors gathered across space and time has now begun!

Zheng Shaopeng, a high school student, dozed off during a history lesson. When he awoke, he discovered that he had changed into the impoverished scholar Yang Lin and had traveled to the Danzhu Dynasty in the history textbook. Initially, Yang Lin struggled to adjust to life in the past, but when he applied contemporary ideas to create a few modest innovations, he won the villagers' affection and eventually discovered a feeling of identity of his own. Yang Lin lived through a time of both internal and exterior unrest, experiencing battles and seeing the agony of the populace. By relying on his knowledge and abilities to acquire access to the court, he eventually oversaw the Danzhu Dynasty's efforts to combat internal corruption and repel formidable adversaries.

Mama Megami, the mother goddess and ruler of paradise is retiring. Her successor appoints a young mage named Lilith to be one of her guardians. Lilith's first assignment is to recruit two more worthy guardians for the new Mama Megami. Not an easy task, as Stashia, the first candidate on Lilith's short list is not interested. Lilith didn't even have a chance to ask the second person on the list, a warrior named Juliana due to a misunderstanding caused by Stashia's little sister Rurubell. Rurubell wants to be a guardian, but Lilith turned her down due to her very young age and lack of experience. Meanwhile, Paradise is under attack by an evil goddess who wants to dominate it, and it's up to Lilith, Stashia, Rurubell, and Juliana to thwart the attackers.