Fire Force was one of several hugely popular shonen anime in recent years, though its creator had been in the industry for quite a while. Created by Atsushi Ohkubo, the manga and its accompanying adaptation made waves in the current era of anime dominance around the globe. Ohkubo is still remembered for his previous series, Soul Eater, but the two have more in common than simply their creator. Thus, some fans wondered if Fire Force was a prequel to Soul Eater.
Source：https://www.cbr.com/soul-eater-fire-force-how-connected-more-than-manga-creator/
