The January 2019 issue of Kodansha’s Young Magazine the 3rd magazine has announced that Petosu’s Interviews with Monster Girls (Demi-chan wa Kataritai) will get a spin-off manga titled Occult-chan wa Katarenai (Can’t Talk With Occult Girls) starting in the next issue on January 5, 2019. Kae Hashimoto is writing the manga’s story, Hajime Honda is drawing the series, and Petosu is supervising.
The spin-off manga focuses on Tetsuo’s niece Yoko and her live-in spirit Zashiko. Sōma will also appear in the manga.
Interviews with Monster Girls launched in the debut issue of Young Magazine the 3rd in September 2014, and Kodansha published the sixth volume in Japan in May 2018.