There are two good ninjas, the white one Roger and the green one 
Ken. They are fighting against Parker, the god of gamblers, with 
the help of the Taoist and his vampires. The vampires win against 
Roger's brother, Steven, who is the real god of gamblers. Steven 
kills himself after losing a cardmatch because that was the bit 
of the game. The Sorceror, Collins, tries to kidnap and kill rich 
people with his vampires. The Taoist must kill the two good ninjas 
because they want to free the world of evil. Steven's son Leslie 
must avenge his father's death, so he asks his old friend to help 
him. They challenge Parker in a cardgame and win. Parker seems to 
follow the rules as he shoots himself in head. But the good ninjas 
are aware that he faked his death. The ninjas intervene and kill 
both Parker and his wife. With the Father's death avenged, the 
good ninjas have only to defeat the vampires with the help of 
their Master. In the battle against the vampires and the Taoist, 
the ninjas use their swords and finally blast the Taoist's head 
off.

Source: Jasko