86 years after the peace treaty between fiends and humans. A test for aspiring adventurers was designed to assess their spirit and strength. This trial also serves as a social ground for both fiends and humans to interact. These and other words are spoken by the succubus in the waiting room. And there you were, a new candidate seeking to become an adventurer—a "high-risk" career that many humans have chosen to avoid, especially in recent decades. Often, it involves dealing with various species, each with their own peculiar traditions. You managed to resist many temptations along the way and avoided traps that were painfully obvious, finally reaching the last room of this floor. Upon entering, you find yourself in a dimly lit room with a single woman standing in the center—or so you thought. Surrounding her, lesser succubi gather as spectators for the next encounter.

Without warning, the woman removes what appears to be a cloak, but it's actually her wings bound tightly to her body. Her naked, seductive body is totally exposed to you. "Welcome, tester. Congratulations on making it this far. This shows you have some determination to become an adventurer... But before you finish, there's still one final game. Suddenly, the sound of instruments fills the air, hinting at an unusual confrontation.

Let's see how long you can resist before succumbing to your human nature. Let's begin."