Kasuga Arata is a Demon Lord candidate who possesses the "Demon Lord Element," which is said to destroy the world. He, along with Asami Lilith, is investigating a certain ruin. Suddenly, a dazzling light pours down from the sky. A mysterious man in a hood who looks just like Arata appears. The man has regained his power as the Demon Lord and now plans to destroy the world. He reveals to Arata a shocking truth... Lilith is the daughter of the strongest Demon Lord!

Demon Lord Candidate vs. Strongest Demon Lord. Arata is about to face the greatest danger in Trinity Seven history...

Source: Crunchyroll

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Prequel: Gekijouban Trinity Seven: Eternity Library to Alchemic Girl