EX
Upon defeating the Last Boss, the ending will be played.
The first time it is played, you cannot skip it.
From the second time onward, it is possible to skip it with the confirmation button.
Also, after clearing the game, the door that was securely sealed inside
the abandoned castle will open and you will become capable of challenging a new boss.
However, there is one condition. You must not be armed with one of the 4 secret weapons.