(Cat Killing Chapter)

Nekogoroshi-hen was written by Ryukishi07 with illustrations by Karin Suzuki, Yutori Hōjō, and Jirō Suzuki; these three illustrators also were the three manga artists of the first three manga released. This novel was sent out to those who bought Onikakushi-hen Vol. 1, Watanagashi-hen Vol. 1, and Tatarigoroshi-hen Vol. 1. One needed to send the cut out stamps in all three of these manga by the deadline in order to receive this special short story. The storyline of Nekogoroshi-hen is divided into two parts. The first half consists of average club activities, with the usual members playing poker with embarrassing penalties. In the second half, the club members decide to head to the abandoned Yagouchi Quarry on the outskirts of Hinamizawa. Mion tells the tale of how one of her childhood friends, called Friend A, went missing while playing hide-and-seek near the area. Friend A was found by his father, but they were found dead in their car on the way home when they went off a cliff. It was rumored that they fell victim to the poisonous gases that leaked from the "hole", which supposedly leads to hell.

The title appears to relate to the phrase "curiosity killed the cat".

This was also released on DVD in anime form, and may be able to be bought online.