https://boundingintocomics.com/2022/10/11/original-creator-suzuki-nakaba-confirms-grudge-of-edinburgh-films-are-missing-link-between-seven-deadly-sins-and-sequel-four-knights-of-the-apocalypse/
Original Creator Suzuki Nakaba Confirms Grudge of Edinburgh Films are "Missing Link" Between "Seven Deadly Sins" and Sequel "Four Knights of the Apocalypse"