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Higurashi no Naku Koro ni Gaiden: Nekogoroshi-hen (ひぐらしのなく頃に外伝 猫殺し編 When the Cicadas Cry Side Story: Cat Killing Chapter) is a short story written by Ryukishi07 that was released on June 2006. It was given as a bonus to those who purchased the first manga volumes for Onikakushi, Watanagashi, and Tatarigoroshi and mailed in the stamps contained in each by a deadline.
It was later adapted by Studio DEEN as a standalone OVA titled Nekogoroshi-hen (猫殺し編, lit. Cat Killing Chapter) and released as a bonus to those who ordered all DVD box sets of the 2006 Higurashi When They Cry anime. The episode was later included in the BD box set released in 2014 along with the series proper.