Trinity Seven: The Seven Magicians 8

 is the eigth volume of the Trinity Seven manga series, written by Kenji Saitō and illustrated by Nao Akinari. The volume was published on April 9, 2014 in Japan by Fujimi Shobo and slated for release in the US on February 21, 2017 by Yen Press.

Synopsis
Lilith has been captured by her own father, the demon lord Abyss Trinity, and he's poised to annihilate Arata Kasuga and his companions. In the face of "Vanitas," the overwhelming power possessed by Abyss Trinity, their only hope is a secret weapon hidden within Sky Library--but the demon lord won't make things easy! Can Arata overcome this most dangerous opponent?

Chapters

 * 32. Parallel Shift & Vanitas
 * 33. Spriggan & Guardian
 * 34. Impel Arm & Trinity Process
 * 35. Judecca & World System

Characters

 * Arata Kasuga
 * Abyss Trinity
 * Lilith Asami
 * Akio Fudo
 * Sora
 * Lugh
 * Lieselotte Sherlock
 * Ilia
 * Arin Kannazuki
 * Yui Kurata
 * Mira Yamana
 * Levi Kazama
 * Master Biblia

Introduction

 * Black Imperial Sword Judecca

Flashback

 * Selina Sherlock
 * Hijiri Kasuga