Hell's Gate, a remote portal situated in the far north of the world, was formerly exploited by the Demon Lord to invade the human realm. But with the help of Shion Bladearts, a legendary figure who wielded Excalibur, and his faithful companions, the Gate was locked, and the overpowering demonic force was eradicated. However, the seal has recently started to fade, and the demons have resumed their destructive actions. A self-centered and lustful farmer named Touka Scott, who cares for his village, has set up traps to halt the demons from attacking. But don't worry; Shion is ready to reseal Hell's Gate and save mankind! Unfortunately, his journey comes to an abrupt halt when he falls into one of Touka's traps and dies. Luckily, Anri Haynesworth, a skilled necromancer, comes to their aid. Although she cannot resurrect Shion, she can transfer Touka's spirit into Shion's decomposing body and take him along to Hell's Gate in his stead. To avoid being left behind, Yuna Yunis, Touka's childhood friend, joins them. Together, they form an unexpected team that might just be the most unsuitable group to attempt to save the world!