Blue Exorcist, Volume 14 (Blue Exorcist #58-62)

Trapped by Professor Gedoin in the hellish prison beneath Dream Town Inari, the Exwires must fight to survive and rescue Izumo. The more they learn about Professor Gedoin's plans, the more they realize the horror they face. Each will need to rely on their own strength, and each other, like never before. But Izumo is determined to meet her fate on her own and save her sister, even if it means her destruction! What will Rin and his friends lose in order to win?