Stoppp this has got me curious nowΣ(  ̄□ ̄||) can't wait to find out what happened animelover
I KNOW RIGHT!!!
I'll give you a hint -- the word "stuck" and "stayed" in the dungeon will point into two direction. Once you read the novel you'll understand who I'm talking about.
I can't help but think that the fifth survivor got stuck in that fucking great dungeon for all these ten years so that the other four could get out.