Demon King is an action RPG.

You will become the Devil King in a place called the Underworld.

You have to revive the Demon King's Castle.

In the beginning, you will be lost.

You are given a chance to return to Earth by saving a piece of tissue.

You can only use the power that you are given by the Devil King.

As you go deeper, you will find various quests and battles.

You will find enemies of various types.

You will also find the items, weapons, and skills that you can use to attack and defeat them.

You can also take care of your pets.

Your pets can fight on your behalf.

You can do a variety of things such as moving, attacking, and special moves.