In the distant future, mankind has mastered space and spread empires across the galaxy. While many choose to colonize distant planets, others choose to remain amidst the stars, ultimately giving rise to a new brand of humanity known as the Abh. Both genetically and culturally different from their Earth-dwelling peers, the Abh soon find themselves engaged in a bloody war that rages across hundreds of planets and set out to restore peace by means of conquest. Enter Jinto, a nobleman and ambassador of the recently acquired Hyde system whose duty is to represent his peoples' interests and rule on the Abh's behalf. In order to be officially coronated to this position, a cold-but-beautiful Abh princess named Lafiel arrives at Hyde to escort him back to the empire's capital. When they are suddenly attacked by an anti-Abh liberation front, however, the festivities are cut short, and the two must flee for their lives against all odds.
When Lieutenant Shin Kudou of the UN air force is shot down over the Pacific by the Anti-UN Alliance, he awakens on a lush island called Mayan, whose natives live by some very strange rules. Their spiritual leader, Sara, intends to keep their lives separate from the rest of civilization to prevent the rise of the ‘birdman’ who will destroy the world. Unfortunately for the natives of Mayan, both sides of the conflict have taken an interest in their island, and all too soon, the outsiders' interference spells a disaster as terrible as any myth.
In the feudal kingdom of Yogo, a dark secret is threatening its proud imperial family, and the Emperor intends to destroy it before it leaks out. Unfortunately this dark secret resides within his son, the young and innocent Second Prince Chagum. Enter Balsa, a wandering warrior who has sworn to save eight lives in penance for those she has taken during her violent career. Upon accepting her role as protector to Chagum, her eighth and final job, the two begin a perilous journey that tests not only their physical endurance and mental resolve, but also the tentative relationship they build along the way. Will Balsa fulfill her penance and protect Chagum as he seeks to understand the nature of his secret? Or will the Emperor's relentless assassins and other powerful enemies get them first?
Both animes focus on a female protagonist that has leadership and battle skills and both animes focus on the dynamics within a royal family.
Furthermore in crest of the stars the female protagonist is also somewhat of a guardian for the male protagonist.
It is easy to fall in love with both protagonists
When the oppressive Kingdom suddenly conquers the planet Kibi, a group of space cadets are stranded aboard the spaceship Amaterasu. With no money or power, the crew is funded by the Space Channel TV station… for a price. For though they are given the money to buy the Amaterasu and battle the Kingdom, Shinon and the rest of the cadets must also become reality TV stars, allowing the network to dictate how they look, how they fight, and how they react when faced with the horrors of death. For the cadets aboard the Amaterasu, the battle has just begun...
Crest of the Stars has everything Starship Operators lacked - mainly an epic, believable storyline and fleshed out, human characters. Don't get me wrong, Starship Operators is decent in its own right, but it lacks the polish and finesse CotS possesses. Both, however, are relatively serious, mature space dramas, and given the scarcity of such series, if you enjoyed one be sure to check out the other.
A strange spaceship crashes onto the island of South Ataria, throwing the world into disarray over its fate. Thus begin the Unification Wars, a worldwide war that eventually unites the planet under the governance of the United Nations. Now, a decade later, the reconstruction of the crashed alien craft – dubbed "Macross" – is complete. However, on the day of its christening, the Macross unexpectedly fires and destroys several approaching Zentradi spaceships. The last hope of Earth, the Macross, begins to wage a lonely war; but what hopes can one ship have when facing against an entire alien race?
Both animes have a militay + sci-fi theme and both animes center around the love story of 2 protagonists.
While Robotech is more action oriented, Crest of the stars is more about the relationship between the protagonists.
Crest of the stars also lacks a real hero.
In a far and distant future, men and women have become mortal enemies. Each living on seperate planets, an interstellar war is being fought between the two very different peoples. Hibiki, a mere 3rd class worker, finds himself in the middle of a huge space battle, facing the nemesis of mankind: Womankind!