re:zero kara tsugihagu isekai seikatsu

Published on April fools of 2019, Tappei Nagatsuki wrote a chapter, commonly known as Tsugihagu or Gluttony IF, where Murder became a habit for Natsuki Subaru, and started to read the victim's Book of the dead during the sixth arc.

This tag implicates re:zero_kara_hajimeru_isekai_seikatsu (learn more).