If you're looking for anime similar to Twinkle Heart: Gingakei Made Todokanai, you might like these titles.
It is the year 2099, and laser-driven photon ships roam the galaxy in search of intrigue and wonder. On a search for discoveries, the newly-built Starlight set out on its maiden voyage, only to run across a mysterious young woman and a strange alien message which only she can decipher. Following intricate clues which hint at the origins of civilization as we know it, the crew of the Starlight now set off for a distant galaxy where their destiny, as well as the future of humankind, lies in wait...
‘Don’t give up! You’ve got to have hope!’ is a mantra that the young orphan Ricky cherishes. Soon he and his dog team up with a toy soldier, and together they stumble upon Gulliver, the famous traveler. Now an old man, Gulliver has built a rocket ship intended for one more journey; so together, Ricky, Gulliver and their friends set off for the Star of Hope. While on their journey through space they encounter a nebula that can make people younger and a cupid that can grant wishes, but more importantly they reach a planet filled with people who once lived on the Star of Hope. The robots that they built, it seems, rebelled against them; and to save their lives they abandoned the Star of Hope. As if things aren’t bad enough, these robots soon attack, capturing the Princess of this world. Can Ricky, Gulliver and the rest save her?
The plot takes place in the near-future on a space colony under construction. It is an action-adventure story following the lives of some young boys surviving in this peculiar environment and society as they are tossed around by fate. “The reality found in mankind's future” will be depicted through their perspective.
It is the year 2267, and all that is left of humanity now lives in the 'Eden colony', a domed metropolis on the moon. Earth has long since been abandoned after a cataclysm left it uninhabitable... or so the inhabitants of Eden are led to believe. But when a young boy named Takeru discovers a photograph of a girl which appears to have been taken on Earth, he begins to doubt that this is the case. With the help of his friends, Takeru decides to visit Earth in search of the girl; despite the fact that it is against the strict laws of the colony and despite not knowing what awaits him there...
In the year 2111, the solar system has been colonized. The colonized moons and planets are lawless and the police are helpless. In order to battle the evil within the solar system, Isaac Godonov creates J9, made up of himself, Blaster Kid, Stephen Bowie, and Angel Omachi. They are a team that will handle any missions the police will not with their robot Braiger... for a price. Meanwhile, the Nubia section of Earth has a plan to destroy Jupiter to create 30 more planets for human colonization. But this plan will result in the destruction of Earth.
Tekkaman is just an average bright boy in his everyday life. However, modern science can turn him into a mighty space warrior. This becomes a reality when aggressive aliens come from space to invade our planet. Armed with a space lance, Tekkaman gallantly goes into action against the grotesque space creatures. During his battles he encounters a mysterious young man from another planet who helps him out whenever he is in danger.
Giant robot Daikengo flies through space to re-establish galactic peace; on-board prince Ryger, who ran away from his planet Emperius to defeat the menace out of his reign borders, in order to save his people; Cleo, corrupted prime minister's daughter, help him along with two nice little robots, Anike and Otoke. They fight evil Lady Baracross, leading invasion forces, with her assistant Roboleon, wearing a Napoleon style hat. Daikengo is the first robot with scuttles on his mouth. When he opens them, his vampyre style teeth are shown and he can spit fire.
Life is never dull for the crew of the Sol Bianca, a group of female pirates who plunder the stars for treasure and fame. On a routine ship raiding, the women run across a boy named Rim, who possesses the knowledge of a great treasure located in his homeworld. Unable to resist, the crew is about to become involved in a dangerous adventure that may cost them their lives!