Under the guidance of Menell, Will goes to a village that has been attacked by monsters. As he subdues the remnants of the demons, the tragedy of the village gradually becomes apparent. A house burned down by piled up corpses. And it was a boy who was burned by flames and turned into an undead (undead) who called out to Menel with a thin voice.

Will and his friends, who travel with Bee and Tonio, finally arrive at the target "City of White Sails (White Sails)". Will is impressed by the big city he sees for the first time and the people who live there. When healing the tiredness of his travels, the bell of an emergency rings. Looking out in a hurry, a big black shadow crosses over their heads--

Will, who was to have an audience with the lord Ethelwald as a "Killing Wyvern," offers to gather private soldiers to eliminate the frequent damage caused by monsters. Ethel once shows an intimidating attitude to such an outlandish offer, but decides to identify Will and forgive it. Head to a bar where adventurers gather to find friends to fight with.

Will, who was appointed as a paladin, was responsible for the reconstruction of the village and the extermination of demons. One day, he goes to "Beast Woods" with Reistov and Menel, who have two names, "Tsuranuki", in order to search for a unit that does not return. He feels something is wrong with the scattered bodies and proceeds to the valley in the back ...

Will and his friends are addicted to the traps of the demons and have routed. After seeing the seriously injured Menel, Will realizes that he has unknowingly put his companion in a dangerous eye, and realizes the difference in ability between his surroundings and himself. It was Menel who showed anger that stood in front of Will who was going to defeat the demon beast alone.

Will talks to some of the dwarfs who have made their new home in Torch Port and learns about the history of the Rust Mountains.

Following reports of undead sightings in Beast Woods, Will and Ru find an old burial site where they encounter a Herald of Stagnate, god of the undead. It turns out the Herald was using the undead to lure Will there and convey a message to him...

Will and his companions set out for the Rust Mountains to fight the dragon Valacirca. On the way, they pass by the City of the Dead, so Will decides to stop and visit his old home.

Just when it seems Will's fate is sealed, Stagnate appears and resurrects the former residents of the Iron Country. Gracefeel transfers their souls into Will, giving him the courage to face Valacirca again. Will's epic battle reaches its climax...