Trivia / The Demon Girl Next Door

• Meme Acknowledgment: The meme "It's all Shamiko's fault" comes from a fanart, yet it became trending in 2019, to the point of being named number 1 in Nico Nico Douga's top 100 memes of the year. NicoNico presented a trophy to Izumo Ito, the creator of this series, and Ito responded with art of a puzzled Yuko and Momo receiving the trophy.
• Portmanteau Series Nickname: "MachiMazo," from the Japanese title Machikado Mazoku.
• Post-Script Season: Originally, the series was going to end with volume 3. Itou had already submitted an outline of her next work and was in the middle of writing the climax when her publisher told her an anime had been commissioned and asked her to continue Machikado Mazoku instead.
• Reality Subtext:
  • Later in the series, the plot revolves around a demonic family registry compiled by the Bureau of Darkness that Suika uses to carry out her genocide of the demons. In real life, the Japanese family registry has been criticized as a tool to enforce Japan's outdated class system by — until very recently — allowing absolutely anybody to trace a person's lineage.
  • In chapter 67, Itou snuck a bit of autobiography into some flavor text inside Ogura's book. She talks about her "overwhelmingly frail" body and how she's suffered from poor health her whole life—as the series' many hiatuses for her health issues will attest^note The format of Kirara—15 yonkoma strips a month plus an eyecatch—makes the workload significantly less than many mangaka.. It's hard not to read an autobiographical element into Shamiko's debilitating issues.
  • Chapter 84 ends with Shamiko using the Whatever Staff too much and passing out. Momo takes it away and staunchly refuses to give it back. The manga then went on a year-long hiatus due to the author's extremely poor health. When it returned with chapter 85, the very first page has Momo hold out the Whatever Staff and say (paraphrased) "You look better, but don't overwork yourself again, got it?"
• Series Hiatus:
  • Ito took several months of break in late 2019, mostly due to overwork. Because of a strange medical terminological issue, what she means to be some functional, probably psychosomatic, symptoms is translated into English into "dysautonomia," a far more serious condition.
  • She subsequently took a month break in summer 2020 after discovering she was starting to get glaucoma.
  • The series has again been on indefinite hiatus since March of 2022 due to the author's poor health, with only a vague "sometime in 2023" estimate of when it will resume, which eventually turned out to be May of 2023.
• What Could Have Been: Momo was originally the main character, and she would've been more overtly violent towards the caring, friendly Shamiko, but Itou decided to soften it up after she made Shamiko live in crippling poverty.