If you're looking for manga similar to Uchuu Ichi no Musekinin Otoko Series (Light Novel), you might like these titles.
Sixteen-year-old Mikako Nagamine enlists as a pilot to fight in the interstellar war against a force of alien invaders, leaving behind her one true love. Mikako’s only connection to Noboru Terao, who’s living the life of an ordinary high school student, is through cell-phone text messages. As Mikoko travels farther away, it starts to take longer and longer for Noboru to receive her messages, until finally one arrives eight years and seven months after she sent it.The war rages on, and years pass, but out in space, Mikako barely ages. When at last the fighting ends, she is left stranded on the spacecraft carrier. A rescue mission is launched to help – including Noboru, who’s now a lot older. When they meet again, they’ll discover whether their young love survived.
In the year 2197, mankind has developed a method of traveling light-years in a matter of seconds, by opening a passage to a parallel universe where matter can travel infinitely fast. These openings have given an alien force, called 'Ghouls', the means to enter our universe. After a brutal attack, a group of new pilots are called in to help with the fight. But can they survive the Captain's brutal training long enough to defeat the Ghouls and protect the station?
In the year 2199, unrelenting attacks from the planet Gamilus have forced all life on Earth into underground dwellings and raised radiation levels to near-toxic levels. The only way to clean up all this harmful radiation is by using the Cosmo Cleaner, which the Queen of the planet Iscandar has generously offered to humanity. Unfortunately, Iscandar is 148,000 light years away, but Earth only has one year before rising radiation levels make it uninhabitable! The only vessel capable of making the journey is the Yamato - a spaceship equipped with advanced technology and modeled after the famous WWII battleship. Can the crew of the Yamato make it to Iscandar and back before the extinction of all life on Earth?
Follow the tale of an Earthling determined to find out why his home planet was destroyed...while sleeping with as many alien girls as possible. It can be pretty lonely being the only member of your species--just ask "Bub", an amnesic Earthling who woke up in outer space and discovered that Earth had been destroyed. As he travels through multiple universes, Bub must figure out his past, what happened to his home planet, and how to best pick up alien chicks--the human race won't repopulate itself, after all!
When Noriko, Amane and their friends left for a week-long summer camp experience in the countryside, they had no idea that they were about to embark on a galactic adventure! After helping a wounded, dog-like alien, the creature offers to take them to a spaceport on the moon where fantastical beings, flashy sights and new friends await them. Together, the gang will travel between worlds, dodge nefarious poachers and even encounter the most famous television show in the galaxy, as they embark on the best summer vacation of their lives!
Obi is a young jedi in training. When he and his master are on a misson to protect the Queen they have to land on the Planet of Tatooine; there they meet Anakin Skywalker, a ten year old boy who seems to have amazing Jedi reflexes.