Urusei Yatsura - Season 1 Episode 178 First Love Again!? A Return to the Past for Lum and Rei!! Grab her horns and she might just become your darling!
Overview: Jariten finds part of a love locket Lum and Rei got when they were going together. At a birthday party for Mendo's favorite octopus, Lum tries to hide this fact, especially from Ataru.