What is Alien in this context?

The Alien (ザ 外国人) :

• Foreigners in Japan are called 外国人 (Romaji: gaikokujin)
• The word 外国人 (Romaji: gaikokujin) literally “foreign country + person”
• 外国人: A foreigner - an alien

Registration of foreigner to local city office (外国人登録事務) :

• After coming to Japan the first thing I encountered is “外国人登録証”
• 外国人登録証 (Romaji: Gaikokujintōrokushō) means “Alien Registration Card”
• Also there is word like “Alien Registration Act” used for foreigners

So, I am Alien (外国人/Foreigner) living in Japan. (See: google translation of “ザ 外国人”)