Ano Natsu de Matteru: You have two cows. Aliens come to Earth and steal one of them.
Another: You have two cows. Nobody acknowledges that they exist.
Chitose Get You: You have two cows. They compete for your affection, unaware that you are not attracted to bovines.
Chuunibyou demo Koi ga Shitai: You have two cows. They pretend to fight demons.
Fate/Zero: You have two cows. You place them in the care of a butcher, sit back, and watch the money roll in.