The Tale of The Bamboo Cutter And The Moon Child: A Japanese Proto Sci-Fi tale From a Thousand Years Ago

One of the first recorded alien visitor stories, from Japan in around 900 AD. Taken from the translation by Yei Theodora Ozaki. Includes a very early version of an interplanetary society.

From the wiki:

The Tale of the Bamboo Cutter (Japanese: 竹取物語, Hepburn: Taketori Monogatari) is a monogatari (fictional prose narrative) containing elements of Japanese folklore. Written by an unknown author in the late 9th or early 10th century during the Heian period, it is considered the oldest surviving work in the monogatari form.

The story details the life of Kaguya-hime, a princess from the Moon who is discovered as a baby inside the stalk of a glowing bamboo plant. After she grows, her beauty attracts five suitors seeking her hand in marriage, whom she turns away by challenging them each with an impossible task; she later attracts the affection of the Emperor of Japan. At the tale's end, Kaguya-hime reveals her celestial origins and returns to the Moon. The story is also known as The Tale of Princess Kaguya (かぐや姫の物語, Kaguya-hime no Monogatari), after its protagonist.