Demons were summoned and used by members of the D∴G Cult during the events in Zero no Kiseki. Humans can sometimes also be transformed into demons by consuming Red Gnosis.
Known demonic entities include
- The Seventy-Seven Devils
- Majin Joachim (Joachim's demon form)
- Earnest (Earnest's demon form)
- Greater Demon (found in the Infernal Castle)
- It is currently unknown if the Infernal Castle and Vermillion Apocalypse has any relation to demons and Gehenna. Various demons and demonic entities are found within the castle, including demonic barriers. Vermillion Apocalypse is referred to as a 'demon lord'. The castle's title as well other aspects of it may hint at a connection.
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