If you're looking for anime similar to Rosetta Kara no Shoutaijou, you might like these titles.
In the future, aliens coexist freely with mankind on Earth. One such alien is NieA, a lazy yet spirited girl who wastes away her days while living with the studious Mayuko. And life isn't easy... Mayuko is always short on food money, the spa where she works is about to go bankrupt and Mayuko's alien-crazy friend Chiaki is obsessed with NieA.
While transporting bio-weapon lifeforms, Agent DD, member of an alien police force, is forced to crash land on Earth. Amidst the chaos of the crash, a bio-weapon escapes and DD is forced to fight it, while accidentally activating a Liberus, a liquid battle suit. Tsubasa, a shy girl, unwillingly comes into contact with the Liberius and is thereafter forced to fight for the survival of Earth.
Kaito re-watches an old reel of film at his house, and he remembers that he created a "test film" to get his awkward friends used to being in front of a camera.
In the evening of a village festival, a young boy named Bunroku goes to the festival with his friend and visits a clog shop on the way. There he learns an old superstition about the fox.
Nayuta is a normal school girl, until she meets a young boy named Kiro trying to help his sick mother. Nayuta takes them to the hospital, but inside Kiro's mother vanishes without explanation and Kiro runs away. Later that night Kiro shows up at Nayuta's house and shows her his psychic powers, enabled by a mysterious tiara he wears.
Gou-chan arrives on earth in search of the "heart plasma" that will restore peace to his home planet EX Panda. He meets a human girl named Moko, who lives on a farm with her grandfather, and several strange animals called "Chinjuumin." They pass their days enjoyably, but trouble begins when humans invade the forest home of the Chinjuumin looking to capture them. Meanwhile, Moko's family life gets complicated when her grandmother arrives from the city.
Sanpei is a boy beekeeper and the sole survivor of an accident that killed his entire family. Sanpei meets Chiyo, a girl who gets stung by a bee, and starts a new life in her village. Eventually, Sanpei cultivates the land that the villagers had abandoned, and then disappears. In the land now filled with flowers, Chiyo waits, believing Sanpei will return.
Hatta Yoichi is a civil engineer who travels to Japanese-ruled Taiwan in 1910 to build a complex irrigation system in the barren southwest. Hatta manages to overcome the initial doubts of local farmers, but a tragic tunnel accident eventually halts the project and shakes his confidence.
Five young women have one thing in common—the careers they planned for themselves weren’t working out. Job dissatisfaction, trying to make ends meet, and personal insecurities lead each of them to start working at a local tourism bureau where their lives become intertwined. As the girls experience their first year on the job, they learn a lot about their town, their industry, and themselves.
Harajuku... The place where culture, kawaii, and fashion come together. Three high school girls Rito, Mari, and Kotoko are planning to open a temporary store called Park. One day, aliens from space come to Earth to take away the culture of humans. That’s when a mysterious girl who calls herself Misa appears. Now, in order to protect the Harajuku that they love, these three girls must be prepared for anything!