Gintama: Mutsuki

Simply put, this is a truly, absolutely serious Gintama fanfic. In short, the male lead is Katsura Kotaro, who acts completely serious in front of the heroine but is an utterly goofy, adorable idiot around everyone else. The heroine seems like a cool, inscrutable scorpion woman, but in reality she's just a somewhat foolish, tsundere, adorable scorpion who likes to pretend she's smart. All right, the author is terrible at writing blurbs and doesn't know what to say, so let's leave it at that!