One thousand Japanese high school students are suddenly thrust into an unfamiliar world rife with dangerous monsters. Their survival becomes dependent on those who awaken to unexplainable powers. Majima Takahiro, a normal second-year student, does not get any such power. Instead, he joins the majority of students building the homestead. But when a group of empowered students revolt, Takahiro is left wandering the forest on the verge of death. Having lost all faith in humanity, he finds salvation from an unlikely source: monsters!
One thousand Japanese high school students are suddenly thrust into an unfamiliar world rife with dangerous monsters. Their survival becomes dependent on those who awaken to unexplainable powers. Majima Takahiro, a normal second-year student, does not get any such power. Instead, he joins the majority of students building the homestead. But when a group of empowered students revolt, Takahiro is left wandering the forest on the verge of death. Having lost all faith in humanity, he finds salvation from an unlikely source: monsters!
Majima Takahiro welcomes his former assailant, now given the name Gerbera, as his third servant. With Lily and Rose still recovering from their ferocious battle, Takahiro begins exploring the forest alone with Gerbera in hopes of finding more monster companions. But he has a mountain of problems weighing on his shoulders, from ensuring the safety of his group to improving the strained relationship between Rose and Gerbera. Not to mention he still hasn’t figured out his own relationship with the human Katou. On top of all that, now Takahiro has to decide whether to change course toward a potential human presence Gerbera informed him of or continue struggling through the dense and dangerous forest in this unfamiliar world.
Escorted by the elven knight Shiran, Majima Takahiro and Lily arrive at a fortress within the monster-filled forest. There, they meet members of the first expeditionary force and Takahiro’s best friend Mikihiko. Not everything is as it seems, however. As the two of them begin to learn more about this world and its inhabitants, they must closely guard their secrets from all those around them. Meanwhile, Gerbera, Rose, and Katou Mana remain hidden in the forest. They continue to keep a watchful eye on the fortress, but an unexpected event befalls them...
A giant army of monsters suddenly attacks Fort Tilia. Among all the chaos and death, Takahiro and Lily must decide whether to reveal their secret, and invite suspicions that they were behind the entire attack. But if they don’t act, their new friends in the fortress will be in danger! Meanwhile, the cheaters of the exploration team, Juumonji Tatsuya and Watanabe Yoshiki, prepare a counteroffensive plan to repel the invaders alongside the army. However, at the final hour, the unimaginable happens. None can peel their eyes from this development!
The monster attack has left Fort Tilia in ruins. Since they can no longer defend the fortress or stay there in safety, Takahiro and the remaining survivors leave to escape the Woodlands. Their destination is the Third Company's home of Aker. Trouble follows close behind them, though. The Skanda, a cheater with overwhelming power even among the students, receives news that Takahiro might've been the one behind the monster attack. Thus she begins her pursuit, ready to bring him and his monsters to justice.
Takahiro’s group finds themselves in a hopeless predicament, facing off against the Skanda Iino Yuna’s overwhelming power. But thanks to Mana’s sacrificial play, they successfully overcome Iino’s strength. However, as a result, a landslide splits the party in two and half the group is washed away by the river raging below the cliff. When Lily manages to find Takahiro and the others who were separated, yet another cheater launches a sudden attack on them. With Takahiro’s forces scattered and exhausted from the previous battle, can he fend off this mad warrior?
After saving Lily from the Mad Beast and parting ways with the Skanda on good terms, Takahiro’s party once more aims for Shiran’s hometown in Aker, seeking a quiet place to live in peace. But first they must find a new vehicle for the more conspicuous members to hide in. They split into two groups; one group goes to find transportation while the other remains hidden. Seeing this as an opportunity, Mana strikes up a plan to get Takahiro to go on a date with Rose while they’re in town. Meanwhile, a strange mist closes in on the others waiting back at camp... As for Iino, she returns to the exploration team with news of the traitor within their ranks. She also relays what she knows about the potentially intentional misinformation the imperial nobility is spreading. With this knowledge, the strongest cheaters in the world plot their next move.
After forming a contract with the Misty Lodge and returning to town, Takahiro and his group once more bump into the cheater Fukatsu Aketora and his traveling companion Thaddeus. The circumstances of their encounter lead to Thaddeus revealing that he is actually a dragon. Thaddeus’s goal, the reason why he’s in town, is to find a stray dragon who has escaped their settlement before any human casualties lead to inevitable repercussions. Agreeing to help, Takahiro embarks on a path that will teach him much about this world and harden his resolve for the future.
After learning the tragic story of a former savior in Draconia, Takahiro is determined to make a place in this world that will accept him and his servants. Accompanied by his new servant Lobivia, he and the rest of the group return to Diospyro where they unexpectedly meet Shiran’s aunt, who informs them of an impending crisis in a nearby reclamation village. Spurred both by his newfound determination to make allies and by his genuine goodwill, Takahiro volunteers to help. However, something strange seems to be going on with Shiran...
After helping Shiran with her insatiable hunger, Takahiro and his group finally arrive at Shiran’s hometown...only to find it under attack by a mysterious company of armored men. Seeing her countrymen being slaughtered, Shiran loses control of herself and takes off on a ghoul rampage. Takahiro quickly gives chase. In the short confrontation to follow, Shiran runs out of mana, Gerbera is debilitated by strange magic, and the group learns the true nature of the threat they’re up against. It turns out the men attacking the town are none other than the strongest knights in the world, those sworn to protect the people alongside the saviors—the Holy Order. In this direst of situations with two of his best fighters weakened, Takahiro defiantly takes up the sword himself to defend everyone.
Takahiro has successfully repelled Travis Mortimer’s Fourth Company from Shiran’s hometown, but he fears his actions could lead to conflict with the entire Holy Order. In hopes of thwarting such trouble, he beseeches the Akerian royal family to serve as mediators. If only the ominous shadow of the fake savior incidents weren’t looming overhead... Meanwhile, Iino Yuna continues her investigation with the Holy Order and discovers the cruel truth behind the incidents. And if that weren’t enough, a mysterious stranger has even more daunting news for her. Can Takahiro secure a peaceful life in this world with his loved ones? Or will the machinations of others force the hand of the visitor who gives hearts to monsters?
The Maclaurin Provincial Army, led by Louis Bard, launches an attack on the elven reclamation village Kehdo, claiming to be there to defeat the fake savior Majima Takahiro. Takahiro, however, is down for the count from being poisoned with Holy Water, and he’s fighting his own battle against Travis Mortimer, the sadistic commander of the Holy Order’s Fourth Company. Without their leader, Takahiro’s group decides to take the surviving elves and flee the village. A desperate chase ensues, and as things get more and more dire, Rose decides to make a stand as her master’s shield.
After a desperate struggle with the Maclaurin Provincial Army, Takahiro, his servants, and the villages’ elves manage to escape their pursuers. His group then moves to Aker’s capital at Prince Philip’s behest so that they can form an alliance. They are far from safe, however. Not only do they need to fend off further threats from Margrave Maclaurin, but now that their secret has been exposed, they must find a way to get the general populace to accept Takahiro’s servants. One day, during their stay at Aker’s royal palace, Iino Yuna unexpectedly visits Takahiro as the church’s envoy to invite him to the imperial capital. Concerned about the unrest spreading through the people, the church wants to discuss an armistice with Margrave Maclaurin. Can Takahiro create peace and happiness for those he holds dear, or will his existence destroy the very foundations of this world?
After arriving safely in the imperial capital, Takahiro meets the exploration team and receives an invitation to join them. However, with Mitarai’s objection and the discovery that Okazaki was one of people responsible for Draconia’s destruction, Takahiro decides to turn it down. He then returns to his room to comfort Mana over her argument with Mitarai, after which the entire group is suddenly whisked away by the power of the Fairy Ring. Takahiro finds himself stranded with Mana, separated from the others in a mysterious and monster-infested labyrinth. Takahiro’s servants are scattered throughout the rest of the deadly maze, and finding their way back to his side won’t be easy, for more than just monsters lurk in these winding halls...
After being teleported to a fabricated world, Takahiro is isolated from his companions. Mikihiko suddenly appears and stabs him, abducting Mana in the process. Takahiro steels his resolve to go rescue her. The stage is set as the Holy Order pits the two best friends against each other in a battle to the death. Meanwhile, things are on the move back in the capital as Kei makes an unexpected discovery, and Mana finds herself faced with the mastermind behind the whole incident, Marshal Harrison Addington, the knight among knights.
Majima Takahiro and his friends survive the ordeal inside the labyrinth and learn the truth about the world. Their very existence threatens to trigger another Grand Calamity, a world-ending event. Fortunately, they also possess the knowledge to preempt such a catastrophe. Set to return to Aker to accomplish that goal, they are forced to go back to the capital when they are informed that the world faces more than one apocalyptic threat.