Time Gate: Apocalypse

Time Gate: Apocalypse is the sixth book in the Time Gate book/pseudo-manga series. Though it is dubbed the sixth book, it can be read directly after The Adult Chapters, as it only occurs in the ending in which Geneva dies during the Trinity War. That being said, it's generally accepted as the correct reading order.

Apocalypse picks up three years after the grim conclusion of The Adult Chapters, with Mitsuhiro still in captivity under Hale's watch following the death of Geneva Harlokian. Completely under the powerful influence of his dark amalgam, Sarj, Hale shows no remorse for his former companions, the Time Keepers, and enacts his own plans to bring Geneva back to the world of the living, while carrying out revenge against Uzuki and her surviving companions. While the Time Keepers, Assassins, and other runaways try to live in hiding from Hale and the Society - reformed by Ikkashi, serving under Hale - Uzuki hurries to rescue Mitsuhiro, all while racing to find a way to bring Hale back to his senses and his soul back into command over his mind, before it's too late.