"Spyrites are spirits revived through the use of Spyrix technology. The Spyrix uses the mana from a Spirit Fossil, the physical embodiment of a deceased spirit manifested in the Human World, to create a physical manifestation of the spirit allowing the wielder use of its power. Unlike other Spyrix however, the use of it does not require the killing of spirits, the manifestation of the spirit requires an additional piece of technology called a "Booster". The spyrites are Elympios' new hope of being able to live on without conflicting with Rieze Maxia."
An anime I watched with my second ex boyfriend. Jigoku Shoujo aka "Hell Girl" deals with in the first season a young girl named Ai Enma of a site called Hell's Correspondence, helps people send the people who made them suffer straight to hell. But with a price: When the one who visited the site dies, their soul also belongs to hell. But later on, you learn of Ai's past.