Continuing on their adventure, Tachibana and Jinguuji arrive in a large town with a market and rows of buildings. But Tachibana's "Unparalleled Beauty" Charms men, one after another, leading Jinguuji to resort to purchasing a certain item.

At the same time, a dark swordsman reacts to seeing Jinguuji's wearing a suit, and challenges Jinguuji to a fight. Then Tachibana and Jinguuji learn that the swordsman is actually their fellow countryman...?!

In order to prove that he is a true hero who has been summoned by a goddess, Schwartz, a high school student who is from Japan just like Tachibana and Jinguuji, has takes on a mission to defeat the living armor which has been attacking tradesmen near the Mercs territory. The living armor only targets magic items, and tries to take Schwartz's holy sword, Gram, and Tachibana's tiara, but...!

The Goddess of Night, called down by Schwartz's skill, explains the mystery behind Jinguuji's arrival in this world. Tachibana and Jinguuji leave the Mercs territory, heading for the royal capital. Along the way, they stop by a peculiar village where squid is adored. There, as part of the preparations for a strange ceremony, Tachibana is kidnapped as a sacrifice...?!

Under the leadership of Ygraine, King Ishurna's daughter, the people have turned into a mob. Tachibana has joined the rebel army after being swept up in everything by Ygraine, Meanwhile, the shadow of the Demon King's army sneaks in, unnoticed. At the same time, Schwartz and Lucius, who have been called in by the king to gain control over the rebel army, head out to intercept the mob closing in on the royal capital, but...

Schwartz's great efforts have led to the devastation of the rebel army. Kalm, one of the Demon Lord army's top officers, has been guiding things from shadows. In order to keep her operation moving, she uses Ygraine and Tachibana to activate an ancient weapon called Mehpon. Even as they falter in the face of the weapon's overwhelming power, Jinguuji and Schwartz set out to subdue it. Then Tachibana, who is being manipulated by the Demon Lord's forces, uses Mehpon to attack them...

In an ultimate final battle, Jinguuji must face his best friend and companion, Tachibana, who, under the influence of evil forces, controls a giant battle robot and threatens to destroy the entire kingdom! But before Tachibana can regain his senses, Jinguuji must first conquer his own personal inner demon...