Trinity Seven: Heaven's Library & Crimson Lord

Arata Kasuga and his companions investigate a set of ruins that are revealed to be the former home of Akio. During their search, they encounter a powerful Demon Lord who intends to destroy the world. This antagonist is revealed to be the father of Lilith Asami, posing a significant threat to Arata, who is himself a Demon Lord candidate. After an initial confrontation, the group finds themselves in the Heaven's Library, where they must face this adversary to protect their world and their friendship.

This Japanese action comedy fantasy was directed by Hiroshi Nishikiori. It is the third film in the director's chronological list of works, following A Certain Magical Index: The Miracle of Endymion and Trinity Seven: Eternity Library & Alchemic Girl, and preceding IDOLiSH7 Movie: LIVE 4bit - BEYOND THE PERiOD. The screenplay was written by Kenji Saito, and the film was produced by Seven Arcs. The voice cast includes Yoshitsugu Matsuoka, Yumi Hara, Ryoka Yuzuki, Aya Uchida, Ayane Sakura, and Rie Murakawa.

Released on March 29, 2019, the film has a runtime of 63 minutes. On TMDB, the movie holds a rating of 7.5/10 based on 62 votes.