Uchujin Desuga Shitsumon Desu - Ch. 1 - First Contact With the Earthlings

[MangaDex]

 

[MarqFJA87]

That is one lazy-ass big sister.

Also, I figured out the numbers thing:

Spoiler

1 squared is 1, 2 squared is 4, 3 squared is 9... and 4 squared is 16.