Urusei Yatsura S01 E06 Die Dreamy-Man!

"Grab her horns and she might just become your darling!"

Ataru, Megane, and friends are going to a Gyudon restaurant for lunch and are quite shocked to see Rei munching down food like a black hole. During the rest of the episode, Rei is chasing Lum, Ataru and friends and as the chase goes on, the chaos grows on.