Ten years after the Book of Darkness incident, Nanoha, Fate, Hayate and friends are all officers within the Time-Space Administration Bureau. With a new Lost Logia threat on the horizon and overworked Bureau units, Hayate establishes the 6th Mobile Division with the help of Nanoha (and her trainees), Fate, and her guardian knights. Together, the gang must train hard and rally their ultimate power in order to once again prevent large-scale multidimensional disaster as a result of the misuse of Lost Logia.
In an era when ordering on the internet has become the norm, online vendors have a new favorite customer: Sakurada Jun! From voodoo dolls to x-ray specs, there's nothing this middle schooler can't get enough of -- until a strange package arrives one day. Inside is a sentient doll named Shinku, who is one of a special hand crafted set of dolls called Rozen Maiden. Luckily for Jun, not only does he get to keep her, but she's decided he'll be... her new servant?! Join Jun as he struggles to keep his sanity in a house full of dolls who all want his servant skills for themselves!
It's actually sort of difficult to explain why you would like both shows, but the fan bases for these two overlap quite heavily. Both the Nanoha and Rozen Maiden franchises definitely fall within the "magical girl" genre, but in many ways innovate past the genre's conventions and provide a similarly entertaining experience despite a lack of directly shared traits.
It is the year 2356 AD, 189 years after a shockwave from a distant supernova decimated the Earth. Since that fateful day, humanity has begun training for a final mission to protect the planet from the inevitable oncoming 2nd shockwave - a mission whose failure means the annihilation of mankind. For Katase and her friends, their training at the foundation Stellvia is just the beginning of an adventure that could lead to saving the world, or seeing its end...
Both animations have mechanical style for fighting. Although one is in space and one on earth, you can have the advanced technology in place. Frindship, team work and robot fighting... they all have it. The graphics are also similar.