Ragna Crimson manga volume 12 features story and art by Daiki Kobayashi.

A few days before the Argentum Corps’ decisive assault on the Winged Monarch, Leonica encounters the most terrifying obstacle yet in her quest for ultimate strength. Back in the present, Ragna seeks an audience with the hallowed Dragon Scourges of the Solarian Church. To prove himself worthy, he leaps into danger—straight down the lair of the elusive Roaring Bloodline!