Good Luck! Ninomiya-kun

Good Luck! Ninomiya-kun (2007) is a animation, comedy, sci-fi & fantasy with 1 season, rated 4.6/10.

Ninomiya is an ordinary high school student who lives at home with his older sister Ryoko. However, Ninomiya's life ceases to be normal the moment a cute girl named Mayu descends into the middle of his school's campus in a military-grade helicopter. It turns out Ryoko sent this girl, along with her older brother Mikihiro, to live at the Ninomiya household.