Princess Brave! ~Jantaku no Kishi~

One Year after the events of Princess Bride, graduation day closes on. Still none of the girls are chosen to be a princess and they are desparete.

One night suddenly black mists engulf the house amids a loud laughter and everyone finds themseves in a magical world. Strange people appear clad in black and our hero gets turned into a dog. Whats is going on? What do you mean the only way to set things back to normal is to win this mahjong game?
A strange and magical adventure begins...

[Translated from Getchu]