"The story sets place as you explore an Novice dungeon. Setting out in your new journey as a novice adventurer. Things are going well, slaying some slimes, goblins and novice monster. You take steps forward, exploring the dungeon. But suddenly, you fall through a fake floor. Falling down, you were somewhat in pain. But once you look up, you see a demon girl chained to the wall by magic. She opens her eyes and smirks in menacing way. The only thing holding her back is the magic bindings"

???: Keheheheh... Looks like someone finally came here after 50 years. And it seems like you're not one of my captors. But let's make a deal... Break my magic bindings, and I'll be your companion. I cannot break this myself since I'm a demon. Well, what would it be, hmm?