Nikola is just a village girl working at the inn...until the day dragons invade, and she meets Haga, a scholar of everything around him. He's a part of an elite society called "Seeker," created to address a series of maladies plaguing their usually peaceful world. But both Nikola and Haga have secrets they hide...ones that will change each other's very existence...

After losing Akira when Entermation Inc. turned their employees into NPCs, Haga and his party decide to complete their jobs as debuggers by moving on to the next country. They hurry towards the capital of Liono, but more challenges stand in their way…

The once powerless NPC, Gaydle, was modified by Yamanaka, another King’s Seeker like Haga, and received an incredibly powerful body. But the warriors of the mountains have had it with his barbarous ways. It doesn’t take long for Haga and his party to be dragged into their deadly battle.

After 365 days of their bug-filled life in the dungeon, Haga and his team finally climbed to the surface. Meanwhile, during their year of absence, the members of Entermation Inc. remained on the surface after having undergone a drastic change, as Nikola and Tesla broke off and went down an entirely different path.

When Haga’s party meets the meta AI responsible for the Principality of Sai, Alba, their opposition of Alba as king results in Alba teleporting Haga and Amano to the 1000th floor of the underground ruins, nicknamed The Diamond. What awaits them is a series of terrifying trials and a chance meeting with a new debugger.

Haga and his party finally escaped the tutorial stage! Although it wasn't part of their initial plans, they now find themselves in the Wilsword Empire. While Haga and his team continue to encounter bug after bug, things get even further out of hand when Catfish gets Princess-napped! As the group pursues the captors, they run into the next biggest obstacle yet…!

“I'll become stronger in my own way…as a villager (NPC) walking down the dark route of an assassin.” A year has passed, and Nikola has transformed into an assassin. After being separated from Haga and the rest of the party, Nikola found herself trapped in the assassin training facility, The House of Stolen Hearts. After a series of grueling training, Nikola's choices led her to the most unexpected outcome…