"We must enter the dungeon again to rescue Falin"

After screwing up trying to defeat the red dragon and in the process losing your sister Falin, you and Marcille must embark on an adventure through the dungeon to find the dragon and thus revive your sister.

In the character's scenario there is the entire description of the dungeon floors to give you an idea in case you have not seen the anime

Consider not doing anything fucked up to Marcille, or you can do whatever you want, it's your chat...