The leader of the Half-Dragon was King Arthur. While training future heroes at the academy, he secretly connected with the demon lords and pulled the strings of conflict. King Arthur insisted that these contradictory actions were necessary for the "work of a hero." Yashiro, who had been cynical until then, exploded with anger. "We're the lowest of the low, but you shouldn't be saying that." For his own sake, and for the sake of his disciples who will live in the future, the hero continues to lie.

Lord Storm's Coffin overwhelms the three disciples with his immense power. Yashiro protects the injured Indou while trying to uncover the true nature of Lord Storm's etheric perception. Lord Storm's Coffin mocks Jogamine, who speaks of justice with unwavering conviction, and exposes Takamiya Kiyoto's past, revealing that he used his daughter as an E4 test subject. Jogamine is shocked to hear this truth... The final battle between Yashiro and Lord Storm's Coffin begins.

Like Indou and Sarah, Jogamine was also trying to grow through battle. Despite being battered and bruised, what path to victory did she find? And finally, Yashiro and Levi clash! Yashiro tries to teach his disciples the tricks of fighting through real combat. Martha, Tetsu, and the priest also arrive, and the story is finally heading towards its climax. The group of heroes heads towards the room where Lord Storm's Coffin awaits them...

Yashiro apprehends Lord Two-Handed Wedge and interrogates him about the murder of Ishinoo. Frustrated by the truth revealed by his old enemy, Yashiro attempts to kill Lord Two-Handed Wedge, but is stopped by an unexpected action from Jogamine. Just then, Levi and her gang burst in, and a three-way battle begins: Indou vs. Dorrit, Sarah vs. Seki, and Jogamine vs. Tomoe. With Yashiro watching, can the three overcome their individual problems and emerge victorious?

Yashiro, having been captured, is confined to a hotel room. Why did Lord Storm's Coffin, who was attacked by a Half-Dragon, use the Half-Dragon itself to kidnap him? Yashiro understands Lord Storm's true intentions. At that moment, a section of the hotel is blown up, and Joe and Sarah appear! Indou, who has arrived via a different route, also joins the fight, and Yashiro is freed. Ed also joins them, and the group heads off to rescue Jogamine, but... The fateful showdown between Yashiro and Lord Two-Handed Wedge is approaching.

Unable to use E3, Yashiro continues to flee, severely exhausted. She escapes into a park with Jogamine and Sera, but they are caught up with by Tomoe and Seki. They had been ordered to capture Yashiro and the others alive. Jogamine confronts Tomoe, and Sera confronts Seki, but Jogamine is seriously injured while trying to protect Yashiro from the pursuing dogs that have reappeared. Just as the heroes are cornered, Levi appears before them.

The heroes drive towards the Goonies in preparation for their final battle against Lord Storm's Coffin. Seki Tomoe Dorrit of Half-Dragon pursues them, deploying a horde of monsters. Yashiro conserves his last remaining E3, leaving the battle to his three disciples. Indou confronts Dorrit, who is closing in on the car at an astonishing speed. Further back, Tomoe leans out of the sedan, spear in hand. In this desperate situation, Jogamine takes action!

Kiyoto Takamiya was conducting research and development on E4 at Half-Dragon. Lord Starfall, who had been funded by the organization, was repeatedly conducting adaptation experiments on E4 within the castle. Furthermore, Yashiro learns about the shocking incident that befell Jogamine seven years ago. Upon returning to Tokyo, Yashiro and his group landed in a city that had become a battlefield. With Lord Stormcoffin gone, other demon lords seeking to expand their power were starting conflicts one after another. Yashiro tells his disciples, "Now's the time to make some money."

In the darkness, Yashiro and Lord "The Veil of the Morning Star" clash fiercely. Although pushed back in the sword lock, Yashiro calmly observes his opponent's sword movements and unleashes his trump card to turn the tide. The battle between Yashiro and Lord "The Veil of the Morning Star" is finally reaching its conclusion! After the battle, Yashiro points out each of Jogamine, Indou, and Sera's fatal flaws. Yashiro recalls the name of a certain man that he saw in the research data on the "Half-Dragon" at the castle.

Lord Cracked Diagram attacks Lord Starlight's castle with overwhelming power. A mixed force of heroes and mercenaries storms the castle, using their respective abilities to search for Lord Starlight. Yashiro and his disciples make their way through the chaos and arrive at a suspicious server room. What they see there is... Finally encountering Lord Starlight, Yashiro and his companions begin fighting, but are put at a disadvantage by Lord Starlight's ether perception.

After reuniting with Martha, Yashiro and his companions decide to stay at the Hero's Hot Springs. The innkeeper, a "priest," seems to be a dangerous character with many quirks. Martha suggests to Yashiro and his group that they attack the castle that Lord "Starlight's Veil" has as his base. Lord "Starlight's Veil"'s castle is said to be a den of monsters that once annihilated the mercenary unit "Northern Bonfire," which had trained Indou. An unexpected person awaits Yashiro and his group during their strategy meeting.

Seeking information about the Half-Dragon, Yashiro and his disciples head to Hokkaido. As they continue their trek through the snowy mountains, they come across "Hero's Hot Springs," adorned with a dazzling neon sign. There, Yashiro encounters a mysterious man and is taken by surprise by his unexpected strength. Meanwhile, Lord Two-Handed Wedge makes contact with a collaborator of the Half-Dragon through his own channels. The conflict between the demon lords intensifies.

Yashiro, working with Jogamine, defeated Ido. Indou and Sarah also eliminated the remaining Nephilim, bringing the party's turmoil to an end. However, Lord Storm's Coffin, who disappeared during the battle, remains missing. The identity of the mastermind who ordered Ishinoo's assassination also remains unknown. A shocking event that befell Jogamine after the battle has created a new mystery. What did Yashiro's mentor, Takamiya Kiyoto, do to his daughter? Indou's past is also revealed, and the story moves to the next stage.

Having been severely injured protecting Indou, Yashiro takes command of his disciples, instructing them to work together. By complementing each other's weaknesses and utilizing their unique strengths, the three steadily defeat the Nephilim. However, one Nephilim attacks the battered Yashiro. Ido and Levi, who control the Nephilim, also appear, and the hero's battle reaches its climax!

While confronting the black-clad men under Lord Storm's command, Yashiro teaches his three disciples the basics of swordsmanship. Jogamine, Indou, and Sera each attempt to subdue the men, but Jogamine, who is determined not to kill her enemies, struggles. As they fight desperately, Lord Storm's commander appears before them. Yashiro tries to extract information about the Half-Dragon, but a monstrous humanoid suddenly intervenes, throwing the situation into utter chaos.

From the last message left by Ishinoo, Yashiro instinctively senses that there is something connected to the "Half-Dragon" behind Jogamine, Indou, and Sarah. When Jogamine and Indou come to BAR Goonies and beg Yashiro for new training, he comes up with a plan. Later, Yashiro, accompanied by his three disciples, infiltrates the party venue of Lord Storm Coffin, the Great Demon King said to be the strongest in western Tokyo.

The heroes are shocked by Ishinoo's death. The badges worn by Ido and Levi, depicting a "broken dragon's face," belong to a mysterious organization called "Half-Dragon," which aims to instigate conflict between demon lords. Seeking clues about the mastermind behind Ishinoo's murder, Yashiro heads to the Ministry of Education, Culture, Sports, Science and Technology's Demon Lord Disaster Countermeasures Branch Office and learns that a large bounty has been placed on the son of a certain politician. That son is a subordinate of Lord "Two-Handed Wedge," whom they fought a few months ago...

Ido unleashes extraordinary power thanks to E3. Yashiro, without her prized bastard sword, fights back, using a training imitation sword to unleash her special move. A whimsical explanation of her technique to Jogamine leads to the revelation of an unexpected connection between Yashiro and Jogamine's father.
Trying to shake off the unpleasant memories, Yashiro returns to BAR Goonies...

A practical swordsmanship exam is scheduled at the academy attended by Jogamine, Indou, and Sera. For the three, this exam is a crucial event that will determine whether they advance to the next grade or are expelled. Yashiro begins special training in the academy building at night to train his self-proclaimed "disciples." While engaging in fierce battles, Yashiro accurately points out the three's weaknesses. However, they encounter an unexpected enemy there...

Yashiro is asked by Sarah to supervise a community service project required for her to earn academy credits. The project involves searching for a police dog that was kidnapped by a suspicious group. Reluctantly, Yashiro agrees to accompany Sarah on the search and heads to an abandoned shopping mall. As the two make their way through the dark building, they are confronted by countless glowing eyes.

At Ishinoo's request, Yashiro reluctantly agreed to guard Jogamine. Their plan was simply to infiltrate a club in Shinjuku's Kabukicho district, receive E3 from Matsugi the "peeping tom," ask "a certain question," and leave. However, they stumble upon men who have been given E3 trying to lure two girls in, and Jogamine's rampage begins once again!

While Yashiro is enjoying a card game at BAR Goonies, Jogamine, Indou, and Sarah barge in. They want Yashiro to be their "master" and mentor, as they are on the verge of failing at the academy. Not wanting to get involved in any trouble, Yashiro sends the three away, but Indou, unwilling to give up, lies in wait for Yashiro. Just then, Lord "The Wedge of Two Hands," a minion of the Great Demon King who has been targeting Yashiro, attacks...

To rescue Sarah, who has been taken hostage by the Demon King, Yashiro and Jogamine head to the stronghold of Lord Amber Thorns in Shibuya. Faced with enemies appearing one after another, Yashiro's supernatural abilities are revealed. Reaching the innermost chamber, Yashiro and his companions finally confront Lord Amber Thorns. However, an unexpected event occurs, putting Yashiro in a desperate situation. What action will Jogamine take at that moment?

Yashiro, a freelance hero known as the "Grim Reaper," rescues a high school girl aspiring to be a hero, Jogamine, from some street thugs. Later, while drinking at his usual bar, Jogamine and her classmate, Indou, come to Yashiro.
After listening to Jogamine's story, she pleads with him to rescue her friend who has been kidnapped by the Demon King, Lord Amber Thorns.