On May 14, 2018, Mashima commented on Twitter that he was becoming "a little confused" due to working simultaneously on this series, a Fairy Tail continuation, and another "secret" project.
Pada tanggal 14 Mei 2018, Mashima berkomentar di Twitter bahwa ia menjadi "sedikit kebingungan" karena bekerja secara serentak untuk seri ini, kelanjutan Fairy Tail, dan proyek "rahasia" lainnya.