Aku no Taizai: Enbizaka no Shitateya

The fifth book in the series centers on Sudou Kayo, a kimono tailor who lost her family in a devastating fire in Enbizaka. Though her physical injuries have healed, she remains emotionally scarred. Her life takes a significant turn when she meets someone important. Inspired by a 2009 Nico Nico Douga song by mothy, the story is linked to the theme of Envy from the "Seven Deadly Sins" series. It portrays a woman who, witnessing her loved one with others, becomes consumed by her work while silently suffering.