SF Whipped Cream(2002)

Original title: ＳＦホイップクリーム

In the year 2060, KEN, a 25-year-old young man raised by aliens living illegally on Earth, makes a living by selling dubious drugs, idolizing Carl Gotch as a god. One day, he is caught cheating on his drug sales and becomes the target of a gang. However, it turns out that KEN's ID is forged and alien, and he is deported back to the planet where he was raised. There, KEN encounters many unusual phenomena.