
If you're looking for anime similar to Cosmic Mission!, you might like these titles.
At a typical elementary school in Japan, yearly chores are being distributed. Yuri and 3 other students are chosen to be the beneficiaries of the alien hats for the year. Alien hats?! Yuri's sentiments, exactly. Despite her misgivings, she and her classmates must round up stray aliens that have escaped from a crashed spaceship -- with the help of the alien hats, of course.
Three years ago the aliens invaded Tokyo. Nothing was ever the same again. But after a while, even impending doom starts to feel ordinary. The Japanese Self Defense Forces are still looking for a way to combat the looming alien threat three years after the invasion, but so far conventional weapons have had no effect on the mothership. Maybe it’s time to try something unconventional. Meanwhile, Kadode Koyama is in high school. She and her best friend avidly track the aliens’ movements on social media and less enthusiastically study for college entrance exams. When the end of the world is overhead, you learn to take things one step at a time.
The story follows a third-year high school girl who likes building plastic models and the wacky conversations she has with her fellow club members.
Takashi Horimachi is an ordinary curious fifth grader attending "Anytown" Elementary School. One day, a very unusual transfer student named Taro Tanaka joins Takashi's class. Takashi and his classmates have never encountered anyone quite like Taro before. He is blue, has huge glowing eyes, pointy ears, a smooth bald head and one horn. Takashi, obsessed with trying to figure out this strange new visitor, attempts to track Taro's every move; and in the process he continuously falls victim to Taro's hilarious assortment of cosmic jokes and traps.
The year is 1969 and alien invaders are trying to dominate the world. The only hope for Earth is AEGIS, a group of teenagers with the special ability to open 'Gates' that let them harness elemental powers gated from another dimension. AEGIS must now seek out other gatekeepers in order to stand a chance against the destruction of the world.
Sonya may look like a regular school girl, but in truth she’s a deadly assassin who keeps to herself. Despite many warnings not to get involved with her, ditzy Yasuna decides that she is her friend, even if it means getting her arm broken or ending up in a headlock each time she surprises the young hitman. And just to make matters worse, ninja girl, Agiri - an associate of Sonya's - also attends the same school. With Sonya resorting to violence at every turn and Agiri parading her various "techniques" at every turn, Yasuna’s school life is about to get all the more hectic... that is, if she can manage to survive in one piece!