- "Four machines created four centuries ago. No one knows how such miraculous things could exist at that time. But, magic is the cause for miracles, so this shouldn't be too out of the ordinary. But still...a single one can very well be a threat to a country. No wonder they're used as seals for the strongest demon."
- — Hakase talking about the Four Archfiends
A seal for the Grand Demon, prevent him from being free again
Archfiend of the Underworld, SatanArchfiend of the Underworld, Satan (極道の魔王・サタン, Gokudō no Maō Satan)
Archfiend of the Heavens, TanninArchfiend of the Heavens, Tannin (天の魔王・タンニン, Ten no Maō Tan'nin)
Archfiend of the Earth, KagutsuchiArchfiend of Earth, Kagutsuchi (地球の魔王・加具土命, Chikyū no Maō Kagutsuchi)
Archfiend of the Void, NihilArchfiend of the Void, Nihil (空隙の魔王・ニヒル, Kūgeki no Maō Nihiru)
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