Everyday is a normal day in the small town where Kasuga Arata lives. However, everything changed on the day of the Black Sun, and following it, a magician appears before him. The Black Sun caused the Breakdown Phenomenon which destroyed the town where he lives. Because of this, his normal life was artificially reconstructed by a Grimoire that his childhood friend had left. Just what is the purpose of the magician coming to the town? What will he do with the Grimoire's keepsake?

Pride, Envy, Wrath, Sloth, Greed, Gluttony, Lust. These are the seven sins laid upon seven girls who rule over Biblia Academy. 
 
To retake his world, the boy decides he must control these sins... The boy, Arata Kasuga, has had the world he knows hit by a mysterious phenomenon "Collapse Phenomenon", and his cousin Hijiri disappears into another dimension. To understand the Collapse Phenomenon and win back his cousin, he comes to Biblia Academy. There he finds the seven girls and their sins.
 
(Source: Crunchyroll)

The film's story begins when Arata inadvertently touches "Hermes Apocrypha," Lilith's Grimoire. Suddenly, he is enveloped by a bright white light, and a girl appears before him. She calls herself Lilim, and treats both Arata and Lilith as her parents. At the same time she appears, something changes in the world. The forbidden Eternal Library awakens. In the Library is sealed the ultimate culmination of Alchemy, the White Demon Lord. The White Demon Lord plots to eliminate Arata and the Trinity Seven to usurp the position of Demon Lord. Bristling with untold power, the White Demon Lord attacks Arata, and triggers a desperate crisis where Arata and the Trinity Seven must save the world in this last battle.
 
(Source: Anime News Network)

Arata, Lilith and the rest of the Trinity Seven ace off against their greatest enemy; Lilith's own father, who is revealed to be the strongest Demon Lord. He challenges Arata who is now a Demon Lord candidate.
 
(Source: Anime News Network)

The story centers on Lieselotte Sherlock, an evil mage from the original manga.

A spin-off of Trinity Seven: 7-nin no Mashotsukai focused on Levi Kazama.

While Arata and the rest of girls are training to go to Dante's Gate, Anastasia goes to Biblia Academy to investigate a strange event that is related to "The Demise."
 
Note: Chapter count includes 1 extra.

From the world of Trinity Seven comes a sizzling new spinoff!
 
High schooler Mitsunari Miyazawa had aspirations of becoming a writer until a run-in with a demonic creature turns deadly. Now, Mitsunari has been reborn with the power of the Magus of Envy, fighting with the help of the living grimoire Lydia!
 
(Source: Yen Press)

An anthology of Trinity Seven: 7-nin no Mahoutsukai by various mangaka.

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