If you liked the Kiddy Grade anime, the Anime-Planet community thinks you'd like:
Twelve years ago, an incident known as "Blast Fall" unleashed major destruction and chaos. Now, years have passed, and mankind has learned to adapt by incorporating cybernetic limbs into its citizens. Roy Revent is a bounty hunter known for his violent acts towards criminals due to the loss of his daughter in Blast Fall; and when a criminal tries to take revenge on Roy, an unknown girl falls from the sky and saves him. She has no memory of who she is, or where she came from. With the help of Miranda, his boss and landlord, he takes in the girl and gives her a name of Solty. What is the real identity of Solty, and what caused Blast Fall?
Solty Rei and Kiddy Grade are two examples of action anime whose plots simply do backflips. Once they get going, it's just one twist after another. Although there isn't really a whole lot of similarity between these two series otherwise, if you liked the roller-coaster plot style of one then the second should please you with a similar experience.
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...
Well, if you enjoyed this scifi anime with plot twists and space flight also because you enjoyed the high amount of fine dressed girls in the main cast, then this anime is another one for you.
The main difference between the series is that Kiddy Grade starts a little comically and shows superpowers whereas Starship Operators handles the physics more realistic.
Life on Earth was changed forever when the SE, the Space Emigrants, invaded. Now, the human population has been driven underwater, and hides in the shelter of aquabases deep at the bottom of the sea. With time running out, humanity launches its final attack, and best weapon: the Angels. These cybernetic women are humankind's last hope of survival against the invaders.