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 by a mysterious "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]

Arata is set to be expelled! The only way to save himself is to be taught more about the magic archives from the Trinity Seven themselves.

[Source: MyAnimeList]

"Daddy-sama! Mommy-sama!"

One day Arata Kasuga, the demon lord candidate who possesses the "demon lord element," casually touches Lilith Asami's grimoire, the Hermes Apocrypha. At that moment, he's suddenly surrounded by light, and a mysterious young girl shows up in front of him. He gives her the name Lilim, and she becomes attached to Arata and Lilith as her mother and father. But in the same moment she appeared, something in their world changed... The forbidden "Eternal Library" has awakened. Sealed within it is the ultimate product of alchemy, a human creation called the "White Demon Lord." The White Demon Lord plans to take out Arata and the Trinity Seven so that he can become the true demon lord. Arata and his companions must face a power greater than any they've ever seen, one that threatens to destroy the world. Can Arata and the Trinity Seven protect the world? Their final battle now begins!

[Source: Crunchyroll]

Arata Kasuga is a Demon Lord candidate who possesses the "Demon Lord Element," which is said to destroy the world. He, along with Lilith Asami, 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]