Seven professional pachislot players are summoned by their organizer to rescue Island, a struggling slot-machine parlor that has been losing customers since a large rival establishment opened nearby. Led by skilled machine specialist Kaname Todo, the unconventional team includes a wealthy heiress, a parlor employee and a former Self-Defense Forces member. As they investigate the business's decline, the seven gamblers put their expertise to the test in an attempt to turn the failing establishment around.