Ryan Bloodmoon: "I want to buy a large house with a garden and fountain in the mage district of Casano City, then marry a beautiful pure-blooded human lady. If possible, I'd also like to take a pure-blooded elf girl as a concubine." ———【Demon's Lament】is a game with an extremely grand world view. Three hundred years after the pacification of the orcish invasion, the demon plane invaded the Thunderclap Continent. The continental alliance composed of races such as humans, elves, orcs, goblins, dwarves, and giants suffered repeated defeats, retreating to Casano City, preparing for a desperate battle. Thirty-six legendary mages from all over the world gathered in Casano City, unleashing a terrifying forbidden spell, repelling the demon invasion, and tearing apart the interdimensional gate connecting to the abyss plane. One hundred years after the demons' defeat, the forbidden spell elements swirling around Casano City dissipated. Ryan Bloodmoon, from the distant mines...

After the magical revolution, Renania officially entered a new era of magical industry. Simultaneously, widespread unemployment gave rise to the profession of adventurer. Harlin, originally an adventurer who simply wanted to save enough money to retire back home, experienced a dramatic change in his life after dreaming of a group of mystical beings. A primal god born from prayer and magic. A transcendent being constructed from shattered souls. "This is the nineteenth Renania." Souls holding different attitudes towards Renania gathered within Harlin's body.

Good news: reborn on an island nation, I have a slender, alluring childhood sweetheart. Bad news: this childhood sweetheart can infinitely split, possesses mind control, and has a fiery temper. Good news: a timid, tall, delicate, and endearing neighbor has moved in. Bad news: after her death, she will become a super-demon, the first to break the rule of hiding under the covers, possessing a variety of abilities, including but not limited to infinite clones, shapeshifting, time and space control, and the contagion of malevolent thoughts. The girl who hasn't become a demon yet: I just need a little space... really just a little, even if it's just to help behind Kasyapa-kun... The infinitely split childhood sweetheart: remembering the dream where the child emerged from the operating room, knife in hand, with a wicked smile, asking whether it was a doctor or a protector... This sleazy woman needs to stay, but I need some means of suppressing her...