Narukami appears as a Magatama in Shin Megami Tensei III: Nocturne. It is obtained after defeating Thor in the Mantra Headquarters.
Megami Ibunroku Persona
Narukami appears as a Persona in the game. Just like the other Personas of the Fool Arcana, Narukami can only be created by fusion accidents.
Persona 4
Narukami is the localized name of El Jihad (エル・ジハード, Eru Jihādo)?, a skill used by Margaret that cannot be learned by the party which inflicits massive Electric damage to all enemies. In Golden, its name was reverted to Jihad.
Digital Devil Saga: Avatar Tuner
Narukami is a combo that deals mega Electric damage to all foes. It can be used by combining Elec Amp, Ice Amp and any Megido skill.
Digital Devil Saga: Avatar Tuner 2
Narukami is a spell that deals mega Electric damage to all enemies and is learned from the Sublime Bolt mantra, which requires mastering all Elec-related Mantras to unlock.