Nobody talks about this one. That's because most people don't know it exists. Ten episodes of pure comedy chaos where the Seven Deadly Sins cast lose their minds in bite-sized audio-drama scenarios that feel like the voice actors finally got permission to break character completely. The jokes land faster than the show has time to explain the premise. If you've ever wanted to hear Meliodas just... unhinged, doing whatever the script demands without narrative structure holding him back, this is it. These aren't episodes so much as they are permission slips for the cast to be funny in ways the main series never allowed.
Nanatsu no Taizai: Tsumi no Kokuhaku Dennou Grimoire! is a comedy ONA. Animated audio-dramas released online.