Trinity Seven: Eternal Library & Alchemic Girl is an anime film that premiered in winter 2017, produced by Seven Arcs Pictures.

About the production: the story comes from a manga, the film runs about 56 minutes and its current status is "finished".

Its main genres are action, comedy, ecchi, fantasy and romance, with themes such as Magic, Male Protagonist, Nudity and Female Harem.

On AniList, Trinity Seven: Eternal Library & Alchemic Girl has an average score of 69%, a good score, and appears on 52,245 users' lists.

The franchise continues in or follows from: Trinity Seven and Trinity Seven Movie - Tenkuu Toshokan to Shinku no Maou.

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)

Official synopsis from AniList.