青の祓魔師 [Ao no Exorcist] Series by Kazue Kato

When Shiemi confronts her old nemesis Amaimon, the demon king of earth doesn’t understand just how powerful Shiemi has become. But for Shiemi to achieve her destiny, she also needs to realize her own strength! Back in Assiah, Satan and his minions square off against Mephisto and the Knights of the True Cross to determine the fate of the world. After receiving some enchanted power-ups, the Exwires prepare to enact their battle plan... moreWhen Shiemi confronts her old nemesis Amaimon, the demon king of earth doesn’t understand just how powerful Shiemi has become. But for Shiemi to achieve her destiny, she also needs to realize her own strength! Back in Assiah, Satan and his minions square off against Mephisto and the Knights of the True Cross to determine the fate of the world. After receiving some enchanted power-ups, the Exwires prepare to enact their battle plan. Rin himself is part of the vanguard that aims to engage the enemy head-on, and the time has come for Rin to fulfill his promise to defeat Satan! less

The Knights of the True Cross and the Exwires have fully engaged Satan on all fronts. Rin confronted Satan head-on, and despite being blown apart, Rin’s own demonic nature allows him to reform and stay in the fight. Meanwhile, Shemihaza begins a ritual to crystallize and trap Satan—a ritual that Shiemi will play a crucial part in. When Satan takes his transformation to the next level, even time itself warps under his power, showing everyone a future they could never have imagined…

Exhausted by the effort to contain Satan, Shemihaza has transferred her role—to Shiemi! Rin and the other Exwires are stunned to see Shiemi again, and old friends reunite. But although the ritual to seal Satan was completed, the demon lord transformed in order to survive... moreExhausted by the effort to contain Satan, Shemihaza has transferred her role—to Shiemi! Rin and the other Exwires are stunned to see Shiemi again, and old friends reunite. But although the ritual to seal Satan was completed, the demon lord transformed in order to survive. Now, his immense form is part of the earth itself, with his heart protected in the center of a vast fortress! The Exorcists and Exwires of the Knights of the True Cross regroup and ready themselves for a renewed assault on Satan’s stronghold, but this time, the forces of the Illuminati will also be defending their father… less