Arata Kasuga studies alongside the seven powerful sorceresses known as the Trinity Seven. With Lilith, Lugh and Akio he joins an expedition to a ruin that turns out to be Akio's hometown and the site of the Heavens Library, said to hold all the world's accumulated wisdom. Now a Demon Lord candidate, Arata faces the greatest threat the group has met, one tied to the Library's secret. This is the second Trinity Seven feature film.