I Opened the Final Boss with My Own Hands

Ki Yeon-hwa, an ordinary convenience store part-timer. After losing her parents to a Gate, she obtained a skill called "Key of Babylon." So yes, she definitely awakened, but… "How am I supposed to fight with a key?" Despite being an SS-rank Hunter, she wasted her skill on trivial things like resealing snack bags. "Let's try this on… the Heavenly Demon Flower Mountain." She seems to have accidentally tampered with a martial arts novel that was her father's keepsake. When she opened the book with her skill, a handsome character popped out—and as it turns out, he's the final boss. Ha ha, I've never even read a martial arts novel. What do I do? Sorry for letting him out without permission, but for now, I'll have to tie him up with a rope. I pulled out the world's destruction button with my own hands, so I have no choice but to take responsibility! I closed my eyes tight and started training the Heavenly Demon. "First, I suppose I need to make a good impression on you." Wait, is this really the final boss? He seems way too obedient. "If you're going to work as a Hunter, don't leave my sight." "Huh?" "Stay within arm's reach of me at all times." On top of that, somehow we ended up working together as Hunters. 'Was this really my plan…?' I had only intended to quietly rehabilitate him and then bow out, but at this rate, it looks like I might end up saving the world alongside him!