Gotta flirt to save the world!! High schooler Takuma Akutsu is terrified of human contact and just wants to live a quite life. Too bad he doesn't have a choice in the matter when nine Valkyrie sisters come...

From MangaHelpers: Hida Kizuna possesses the HHG (Heart Hybrid Gear) ability, but it is not strong enough to make him particularly important. His older sister calls him to transfer to a strategic defense...

Momo is the younger sister of Lala, the alien princess who has long since been engaged to the human Rito. Although Rito’s heart continues to waver between Lala and his first crush, Haruna, Momo finds herself...