Blue Exorcist Vol 4

While most of the students at True Cross Academy head home for the summer break, Rin and his classmates are sent to a training camp in the forest district, and the right to go on a real mission is riding on their performance! Locating and recovering their objectives in the woods is tough and will require teamwork, skill and more than a little magic—and Rin will have to learn to rely on his friends. But is Mephisto masterminding something behind the scenes?! -- VIZ Media

Raised by Father Fujimoto, a famous exorcist, Rin Okumura never knew his real father. One day a fateful argument with Father Fujimoto forces Rin to face a terrible truth—the blood of the demon lord Satan runs in Rin’s veins! Rin swears to defeat Satan, but doing that means entering the mysterious True Cross Academy and becoming an exorcist himself. Can Rin fight demons and keep his infernal bloodline a secret? It won't be easy, especially when drawing his father's sword releases the demonic power within him! -- VIZ Media

Shocked by the death of his foster father and the revelation that his real father is the demon lord Satan, Rin Okumura enters the True Cross Academy to learn to be an exorcist. But every great exorcist has to start somewhere, and for the students of the academy the first step is the Exwire examination. To prepare for the exam, the new pages in Yukio’s class must undergo intensive training. Rin and his classmates have their hands full when a demon appears, but is this a test or something more sinister? -- VIZ Media

As the True Cross Academy festival reaches its peak, trouble is brewing. While Izumo confronts Nemu Takara, Rin and the rest of the Exwires race to find her. The betrayal they discover and the tragic details of Izumo’s past will shake them to the core and herald the beginning of an all-out war between the Illuminati and the Knights of the True Cross! -- VIZ Media

An attack on Tokyo by a huge demon that is visible to almost everyone marks the start of an unprecedented outbreak of demonic activity around the world. While the Knights of the True Cross and the Japanese government scramble to contain the damage, Lightning’s investigation into the Illuminati has pushed the Knights of the True Cross—and Yukio—just a little too far. Now Yukio rushes to confront Mephisto, determined to hear the truth of the circumstances of his and Rin’s birth. Yet Mephisto, aloof as always, still seems to be pulling everyone’s strings. For Yukio and Rin, there will be no easy answers... -- VIZ Media

The seals binding the artificial Gehenna Gate are broken, and the world is gripped by demonic chaos! The Exwires try to figure out what to do without Rin and Yukio, the Knights of the True Cross scramble to regroup and everyone seems lost. As nations around the world struggle to contain the outbreaks, Rin faces Mephisto, demanding to hear about his past. Mephisto couldn’t be more delighted to show Rin what happened all those years ago, but as Mephisto warns him, the story can only end in tragedy... -- VIZ Media

The tragic story of what happened to Rin and Yukio’s mother, Yuri Egin, continues to unfold. Yuri and Father Fujimoto were once up-and-coming young Exorcists involved in Section 13’s extensive operation to research elixirs of immortality and develop clones to house the spirits of demons. The project seemed to be moving ahead until the unexpected manifestation of a demonic spirit into one of the clone bodies. And not just any demon—the most powerful demon of all: Satan! -- VIZ Media

Now back in the present, and with the terrible, tragic knowledge of the truth of his and his brother’s birth, Rin confronts Yukio aboard the stricken Illuminati airship, Dominus Liminis. As the brothers face off, Satan does his best to drive them both further into his grip. Rin wants to bring Yukio back into the fold of the Knights of the True Cross, but Yukio is firm in his desire to force Rin to kill him. With the airship going down in flames, the battle for Yukio’s soul begins... -- VIZ Media