"I just wanted to run a café... not fight monsters in dungeons..." Seo Elena, an office worker, quits her job and opens a café, but things take an unexpected turn when there turns out to be a dungeon underneath it! Somehow, she also awakens and even survives an S-rank dungeon! Despite awakening, she's still set on opening her café and running it peacefully. But why does she keep getting dragged into these tragedies?! And why are the S-rankers suddenly so interested in her?! Alternate title: Top Floor Cafe