So I am not going to repeat answers written by others. Here are some of the shorter animes that will leave you wanting for more, but you have to deal with the fact that you are not going to get more.
Set in the future where humanity is driven to live under a dome system as the surface of the earth is inhabitable due to global warming, and humans are controlled by few and are made to live like robots.A group of rebels who escaped the system must find another place to find a better place of living. Soundtrack is captivating.
Hungry Heart: Wild Striker
This is not Captain Tsubasa. A teenage Kanō Kyōsuke, who have a famous brother playing for AC Milan. People starts comparing him to his brother and starts criticizing for his playing style to a point where he is gives up on football and couldn’t care less about anything. This follows his journey to rediscover his passion for football.
Rurouni Kenshin / Samurai X
A story of a wandering swordsman who is actually an infamous assassin trying to leave his past and looking for a peaceful life. He is given shelter by a woman in her dojo in return for saving her from murderers.
Ginji Amano is the former leader of a gang called "The VOLTS" who have the ability to generate and control electricity which is how he got the nickname of Lightning Emperor.
Ban Mido possesses incredible superhuman strength, speed and fighting techniques. He also inherited the Evil Eye technique from his grandmother which allows him to force anyone he makes eye contact with watch a one-minute-long illusion
The story of Ginji Amano and Ban Mido who operates a freelance repossession service. For a fee, they will recover any lost or stolen item for a client with "an almost 100% success rate". Which often leads them into bizarre and dangerous situations.