Kabushikigaisha Ankokujou no Last Boss-chan

It has been five years since the previous Last Boss was defeated by the adventurers. Now it is time to summon the new Last Boss to rebuild the Dark Castle! But what came out to greet the awaiting monsters was… a little girl? Can she lead the company of monsters to rebuild the Dark Castle and fight back the invaders? *Note: Includes 1 extra chapter.*