A modern girl is made into a Dungeon Core. A familiar story, to most. But the price of power is always steep, and  when unknowable forces are afoot, the cost might not be the intended price, and you might not be the one who pays. And if the System itself is a familiar soul... Well. At least trust will not be so difficult to find.  ShiningMoonlightInTheDarkness helped make this. Many thanks to her.