“You thought I was dead?!” Despite having been sliced in half, Vivian stood up. She was now back to normal, and while her clothes being cut apart gave her a somewhat immodest appearance, her skin wasn’t so much as scratched. Even the blood and guts that had spilled all over the floor had disappeared.

“What? Oh, I see. Now that I have your ability, I understand. You come back to life even when you die.”

“Precisely! I thought it was meaningless with my invincible defenses, but on the off chance I am slain, I will return to life! This is the power of Advanced Shield Resurrection!”

...

“I guess I can kill you without worrying about it, then.” Yogiri unleashed his power. As the boy made to jump forward, he fell to the ground, motionless. They waited and watched for a while, but he didn’t stand up like Vivian had. He was truly dead.

“So, looks like the people you kill really die for good, huh?” Tomochika said.

“It’s pretty obvious that dead people don’t come back to life. I thought that was common sense.”

-Volume 7 pages 67, 68, and 70