Hell's Gate, a gateway that the Demon Lord formerly used to enter the realm of humans, is located far to the north of the planet. The Gate was sealed off and the demonic danger was defeated thanks to the great hero Shion Bladearts, wielder of Excalibur, and his devoted group of allies. Sadly, the seal was not complete and has started to deteriorate, allowing the demons to resume their onslaught. Touka Scott, a selfish and perverse farmer, creates hazards to fend off the demons out of concern for the protection of his hamlet. Shion is on his way to reseal Hell's Gate and preserve humanity, so do not be alarmed. The fabled hero has since perished after falling into one of the traps Touka dug, so he was at least alive. Thankfully, necromancer Anri Haynesworth specializes in dealing with the dead. Even if she couldn't save him, Anri may still complete their mission by putting Touka's soul inside Shion's dead body and bringing him through Hell's Gate in place of Shion. Yuna Yunis, Touka's childhood friend, comes along since she doesn't want to be left behind. The three of them set off as what may be the most inappropriate group to ever attempt to save the world together!