Ore no xxx wa Iranai Rashii

After their home planet is destroyed and they are tasked with ensuring the survival of their descendants, Rosa, Flem, and Liz come to the far-flung, remote planet of Earth, relying on an ancient contract. The Earthling they visit is a reclusive, eccentric boy named Kagejino Miri, who is prone to prejudice. Earth's "common sense" doesn't concern the three of them,

They enjoy life on Earth freely, carefree, and the way they want to!! A comedy about interstellar interactions between strong alien girls and eccentric, prejudiced Earthlings!

(Source: Kadokawa, translated)