With the anime for Gachiakuta releasing this month, I'm reminded as to how, alongside Call of the Night / Yofukashi no Uta, that was one of the other two series I was thinking about writing before I settled on Fire Force and Soul Eater.
It's also ironic that the Mangaka of Gachiakuta, Kei Urana, interned under the Mangaka of Soul Eater and Fire Force, and even helped on the latter.