At the D-Rank raid, Jinwoo is reunited with four of the Cartenon Temple survivors. Together, they explore the dungeon with Kang Taeshik and his men. After splitting up, they hear a scream, and then...

Jinwoo answers a Hunter's Association request to take part in the raid of a D-Rank dungeon, where he encounters a few familiar faces.

As Jinwoo continues his training, he completes a daily quest one day by doing more than the quest requires, and a key that leads to a certain item appears in front of him.

While the C-Rank dungeon raid by Jinwoo and the others seems to be progressing well, the moment they step into an area covered in mana stones with a sleeping dungeon boss, things take a wrong turn.

Jinwoo joins a party led by Hwang Dongsuk to meet the headcount necessary for a C-Rank dungeon. Joined by another temporary hire, Yoo Jinho, the party defeats beasts without much trouble, but Jinwoo has suspicions about the group's lack of a healer.

Having entered the instance dungeon located inside the subway, Jinwoo levels up time and time again by fighting waves of magic beasts. As he gradually makes his way forward, he finds a long stairway leading deeper underground.

Jinwoo remains behind in the temple dungeon to save his few surviving party members, and with a swing from the god statue's blade, his life comes to an end—or so it seems, before he wakes up in a hospital bed.

Jinwoo and his party appear to have cleared a low-level dungeon, when a hidden path to an unfamiliar temple is revealed. There they encounter a set of commandments and a group of monsters that cause them absolute despair.

Drained from endless battle, Jinwoo sees a phantom of his past self. To overcome his own past as the Weakest Hunter of All Mankind, he struggles to find a way to clear the job-change quest.

Out of the blue, a "job-change quest" pops up in Jinwoo's window. Feeling that it may help him get stronger, he enters the gate. Inside, he fights wave after wave of enemies, culminating in a knight who brings back memories of the Cartenon Temple.

Jinwoo survives tragedy once again, but Woo Jinchul warns him that Hwang Dongsoo, an S-Rank hunter, may be after his life. Determined to grow stronger, Jinwoo teams up with Jinho to raid a succession of C-Rank dungeons, but they attract attention...

Around ten years ago, gates that connected our world to another dimension began to appear, leading to the rise of hunters who would traverse these gates to fight the magic beasts within. Sung Jinwoo, E-Rank hunter, is the weakest of them all.

A fierce battle unfolds between Denji and the menacing Samurai Sword. But even after Denji takes one of Samurai Sword's companions hostage, Samurai Sword slashes through them both until Denji is captured. Meanwhile, after seemingly being killed, Makima turns out to be alive. She sets out to rescue Denji with the help of Public Safety Devil Hunters from Kyoto, Kurose and Tendo.

Denji experiences his first, yet devastating, kiss. An intoxicated Denji is taken to Himeno's house, where she starts seducing him. Feeling torn between Makima, whom he admires, and Himeno, who is standing in front of him, he decides to fall into temptation. However, Denji then finds something in his pocket: The Chupa Chups lollipop that Makima gave him.

Aki gets stabbed by Kobeni while protecting Denji. Seeing this, Denji jumps inside the “Eternity Devil” and starts attacking it. He fails to kill the “Eternity Devil” and his chainsaw power ends up fading after losing too much blood. But then, he manages to restore his power after eating the devil’s flesh and drinking its blood, and begins to fight back. As Himeno watches Denji, she remembers the saying, “The Devil Hunters that devils fear are the ones with a few screws loose...”

Denji and Tokyo Special Division 4 members enter a hotel to collect a piece of the Gun Devil. However, they end up being trapped on the 8th floor due to the devil’s extraordinary power. With the members being cornered on the endless 8th floor with seemingly no way to escape, the devil makes them an offer: “If you let me eat Denji, I will let all of the other devil hunters leave in one piece.”

Aki Hayakawa, Denji, and Power start living together. Denji finally fulfills his dream of touching Power’s boobs, but is shocked when things do not turn out the way he expected. As Denji realizes that chasing his dream was more fun than achieving it, Makima approaches him and says, "If you can kill the Gun Devil, I’ll grant you one wish.”

After a fierce battle, Denji defeats the “Bat Devil” and rescues Power even after she had trapped him. He says it is all for the sake of “touching Power’s boobs”. Power mocks his ridiculous motivation saying “that’s a pretty dumb reason”, but still agrees to let him fondle her boobs. As Denji gets thrilled with the idea, he faces a sudden attack from out of nowhere...

Denji decides that his new dream is "to fondle some boobs." His partner, Power the Blood Fiend, offers to let him feel her boobs only if he rescues her old pet cat Meowy from a devil. With his dream in sight, Denji is all fired up and ready to go, until...

After being taken into custody by Makima, one of the Public Safety Devil Hunters, Denji finds himself head over heels in love with her thanks to her suggestive insinuations. Wishing to team up with Makima, Denji arrives at the Devil Hunters Headquarters in Tokyo, and gets introduced to Aki Hayakawa, a senior hunter that he was supposed to partner with. But then Hayakawa beats Denji up, and demands that he “quit this job”...