Love Limit

In an effort to support her sister's future endeavours as a matchmaker, Eiren Reeves agrees to a blind date her sister sets up. Several hours later, when her date's a no show... The planet is invaded!? But hold on a moment... The invader looks rather familiar? No, it couldn't be. There's no way Eiren's date is an alien invader that just put the fate of the world in her hands, right? Unless...?