Urusei Yatsura S01 E98 And Then There was Nobody!?

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

Ataru, Lum, Shinobu, Mendo, Onsen-Mark, Sakura, Cherry, and the Stormtroopers have a stay at a mansion, where they are slowly picked off one by one in a manner similar to the nursery rhyme Cock Robin.