Volume 9

Into The Abyss is the ninth volume of the Fire Force manga series, written and illustrated by Atsushi Ōkubo.

Chapters

 * Chapter 70: The Meaning of Protecting
 * Chapter 71: Tamaki vs. Assault
 * Chapter 72: Ballistics
 * Chapter 73: Burst with Pride
 * Chapter 74: The One-Shot Saber
 * Chapter 75: The Pride of a Fire Soldier
 * Chapter 76: A Piercing Will
 * Chapter 77: Connected
 * Chapter 78: Elder Brother and Younger Brother

Summary
With the help of their new scientist Viktor Licht, Company 8 has tracked the Evangelist's minions to their hideout in the forbidden underground known as the Nether. With special permission from the Holy Sol Temple, our heroes launch an attack, but the enemy is ready for them. And when the members of Company 8 become separated from one another, they must find the courage to face their battles alone!

Reception

 * In its first week of sale in Japan, volume 9 sold an estimated amount of 34,943 copies and during its second week it sold an estimate amount of 37,947 copies, giving a total of 72,890 sold copies as of June 25, 2017.