Heroine na Imouto, Akuyaku Reijou na Watashi  

When Christina first met Mishuly, she was reminded of memories from her past life. Through these recollections, she discovered that Mishuly was the main character in a particular story. Despite the fact that in this narrative, Christina was depicted as mistreating her sibling, in reality, she became a siscon who pampered Mishuly beyond measure. However, one day Christina came to a startling realization - the most prosperous future for Mishuly was tied to the story's conclusion. Regardless of whether it ended in death, self-harm, or exile, nothing positive could happen to Christina if she followed that path. Despite this knowledge, Christina remained resolute in her decision, putting Mishuly's happiness above her own destiny. This narrative follows the journey of a siscon who disregarded her own fate in order to bring joy to her sister.

Heroine na Imouto, Akuyaku Reijou na Watashi began as a web novel on Shousetsuka in Narou on June 12, 2015, and completed with 114 web chapters on September 4, 2016. Shufu to Seikatsusha released a revised and illustrated version of the series from April 28, 2016 to December 23, 2016 under its PASH! Books label.