Made in Abyss: Dawn of the Deep Soul finally made its long-awaited premiere in Japan last 17th January. And on the very next day, the staff announced that it’s getting a brand new sequel anime project. They first revealed a video highlighting the previous anime projects before announcing this new one:
So far, we only know that there is indeed a sequel coming. However, they did not reveal whether this new sequel would be a second season of the TV anime, or another theatrical release.
As for Dawn of the Deep Soul, the film is now screening in Japanese theatres. It serves as a direct sequel to the TV anime, as Rico, Reg, and Nanachi journey deeper into the lower levels of the Abyss. However, they run into the White Whistle that turned Nanachi into the creature that she is.
source: Comic Natalie