When a hardcore gamer downloads an update that transports him into his favorite game, Dungeon Explorer Chronicles, he expects a life of pretty girls and epic fights. He starts as a student at Adventurers’ High, the top school for budding adventurers, eager to dive into the fantastical dungeon that’s appeared in modern-day Japan. But one glance in the mirror shatters his dreams of badassery! He’s entered the game as Piggy, the love-to-hate overweight villain whose stalker-like obsession with his reluctant fiancée spells his doom. With elitist bullies roaming the school halls and cutthroat adventurers lurking in the dungeon, our hero has to act fast to lose weight and level up if he wants to survive and break free from his scripted fate. Using his peerless knowledge of the game, he’s ready to exploit every trick to become the world’s greatest unsung hero!

And so the Battle of the Classes continues. Piggy and company have only just finished fighting for their lives against a vicious devil when a fiend ambushes them. To make matters worse, the fiend is a former DEC player with a shaky grasp on his sanity, and he traps Piggy on the twentieth floor. The exam isn’t any easier for the rest of Class E as Class D is intent on sabotaging their efforts; meanwhile, nefarious clans are hatching deadly plots to end the class once and for all. Will Kano be able to save her brother’s classmates? Even if Class E makes it through the Battle of the Classes unscathed, student council elections are right around the corner. Piggy will find himself in the middle of the political machinations of the most powerful factions of Adventurers’ High. With conniving clans and scheming students on the scene, how much longer can Piggy keep his true strength a secret?

The Battle of the Classes draws near, and students must compete inside the dungeon for a weeklong exam to prove their superiority. Rising above their past defeats at the hands of the elitist bullies of the upper classes, the brave Class E students devise a cunning game plan to maximize their odds. Luckily, they have a secret trump card—Piggy, the overweight and overpowered former villain. His orders are “Tag along with the upper classes, and try not to embarrass us!” This is perfect for Piggy, not being a fan of the limelight! He can use this opportunity to get to meet the diva of class A, his game-era crush, as well as share diet tips with a newfound armored friend—but a spy in his class is determined to unearth his secrets. That’s the least of his problems, as the mastermind of Class B threatens the students of every class. Little does Piggy know that his greatest battle awaits him!

Betrayed and left for dead by members of the Soleil Clan, Piggy and his sister must fight against an overwhelming monster. Although they come out victorious, the battle leaves Piggy a shell of his former self. The siblings now have to dive deeper into the dungeon to enlist the help of a fiend to heal him. Piggy vows revenge on Soleil, but acting soon would put his family at risk. The only solution? A family trip to the dungeon to slaughter some monsters! Meanwhile, Akagi’s defeat has soured the mood in Class E and bolstered the rest of the school to keep them on their knees. Piggy will need to keep his true identity a secret as his classmates prepare for the Battle of the Classes. But the other students are taking notice, and something seems off about his classmate Nitta. More adventures await the overweight villain as he teams up with his beautiful classmates, fights crooked proctors, and impresses sexy ninjas!

In the aftermath of the Battle of the Classes, Piggy hopes for a little respite, but he’s in for a disappointment. Tsukijima, Piggy’s hotheaded classmate and former player of Dungeon Explorer Chronicle, finds it insufferable when the many bullies of Adventurers’ High once again target the lowly students of Class E. Piggy goes into panic mode when Tsukijima’s violent retribution leads to a duel between Tsukijima and Ashikaga, a powerful student and member of the nobility. If Tsukijima exploits his game knowledge to easily win this clash, it could have significant consequences. Everything could spiral out of control if this world isn’t steered in the path of the game’s good ending. Now that he deeply cares for Piggy’s family and Kaoru (his childhood friend), the player inhabiting his body must also use his “cheats” to keep Tsukijima in check before it’s too late.