Seven days. The seven deadly sins

Seven Days: The Seven Deadly Sins is a two-volume manga adaptation of the light novel series written by Mamoru Iwasa, which serves as a side story to Nakaba Suzuki's sprawling high-fantasy epic, The Seven Deadly Sins. Published between 2014 and 2015, the series focuses on the character Ban and his formative encounter with the fairy Elaine in the Fairy King's Forest. This narrative expansion was conceived to provide deeper emotional context to Ban's tragic backstory, further establishing the lore of the Britannia setting that Suzuki introduced in his primary serialization.

The adaptation features illustrations by Kokkuryo, who worked to maintain the distinctive aesthetic established by Suzuki while capturing the more intimate, melancholic tone of this specific prequel arc. The series was designed to appeal to existing fans of the franchise by pivoting from the grand-scale shonen battles of the main title to a more character-driven romance. It was generally well-received by the fanbase for successfully bridging the gap between Ban's stoic demeanor in the main story and his deeply motivated past, adding a layer of narrative richness to the overarching Seven Deadly Sins universe.