In chapter 173 of Nanatsu no Taizai, it was revealed that the special Nanatsu no Taizai: Seisen no Shirushi will premiere on August 28th. Previously, the anime's official website had revealed that the anime would receive 4 special episodes.
The author, Nakaba Suzuki, is writing a new story for the special titled Nanatsu no Taizai: Seisen no Shirushi. In Brazil, the manga is published by JBC.
The team also revealed the look of the new series. See the photo below.
Source: ANN
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