The time is the Sengoku (Warring States) period. While Busho military commanders engage in fierce battles on history's center stage, ninjas risk their lives for their commanders. When two ninjas meet, one of them must die, because whoever discovers their identify shall not stay alive.
This is a one-on-one ninja battle game. The player on the offense plays Attack cards from his hand. The player on the defense guards against the attack with his cards. The player who manages to exhaust his opponent's Strength deck wins the game.
