Trinity Seven: The Seven Magicians 17

 is the seventeenth volume of the Trinity Seven series written by Kenji Saitō and illustrated by Nao Akinari. The volume was released on August 8, 2017 by Fujimi Shobo.

Synopsis
Guttlehoge of the Twelve Demon Commanders attacks with enormous strength, forcing Hijiri and Anna to summon every iota of their magic, leaving their bodies bloodied and bruised…The two girls pour all their strength into one final, desperate gambit—a forbidden spell that could cost them their lives! What outcome awaits them on the other side of this fight?!

Chapters

 * 72. Three Six & Seven's Head
 * 73. Seventh City & Holiday Side
 * 74. Lost Magus & Alchemic Daughter
 * 75. Assault Attack & Discourage
 * 76. Plotter & Dictator

Characters

 * Arata Kasuga
 * Black Imperial Sword Judecca
 * Lilith Asami
 * Arin Kannazuki
 * Hijiri Kasuga
 * Yui Kurata
 * Mira Yamana
 * Akio Fudo
 * Lieselotte Sherlock
 * Selina Sherlock
 * Levi Kazama
 * Gatolhog
 * Libik
 * Last Trinity
 * Master Liber
 * Anastasia-L
 * Melione
 * Astil Manuscript
 * Ilias Fragment
 * Rubina
 * Melacoda
 * Radix Astil
 * Lugh
 * Lilim
 * Grafia

Cameo

 * Master Biblia
 * Arsha
 * Ryuhime Kashin
 * Ryuki Kashin
 * Dragunazo

Trivia
TBA