Seraph of the End Vol. 23 (manga)

Yuichiro and his friends regroup to plot out their next steps in the ongoing war between the humans, vampires, and the Hyakuya Sect, and time is not on their side. Shinoa fights for her life to keep the First trapped inside of her. But the First has allies on the outside. With Krul now on Shinoa Squad’s side, they may actually have a chance of winning and saving Mika. But first, the gang learns the truth of what happened between Krul and Mika eight years earlier…