A year and a half after the events of the original sci-fi psychological thriller, Akane Tsunemori continues her work as an inspector—enforcing the Sibyl System's judgments. Joining her are new enforcers and junior inspector Mika Shimotsuki, a young woman blindly and inflexibly loyal to Sibyl. As Akane ponders both the nature of her job and the legitimacy of Sibyl's verdicts, a disturbing new menace emerges. A mysterious figure has discovered a way to control the Crime Coefficient—a number compiled from mental scans that allows Sibyl to gauge psychological health and identify potential criminals. Through these means, he is able to murder an enforcer, leaving behind a cryptic clue: "WC?" scrawled in blood on a wall. Akane and the rest of Division 1 soon find themselves playing a deadly game against their new foe, coming face-to-face with a conspiracy threatening not only the authority of the Sibyl System, but the very foundation of Akane's own convictions. [Written by MAL Rewrite]

After helping revive the legendary vampire Kiss-shot Acerola-orion Heart-under-blade, Koyomi Araragi has become a vampire himself and her servant. Kiss-shot is certain she can turn him back into a human, but only once regaining her full power. Araragi has hunted down the three vampire hunters that defeated Kiss-shot and retrieved her limbs to return her to full strength. However, now that Araragi has almost accomplished what he’s been fighting for this whole time, he has to consider if this is what he really wants. Once he revives this powerful immortal vampire, there is no telling what she might do, and there would be no way of stopping her. But there is more to the story that Araragi doesn’t understand. If a newborn vampire like him could defeat the hunters, how did they overpower Kiss-shot? Can he trust her to turn him back to a human? And how is that even possible in the first place? Araragi is at his limit but he must come to a decision, and it may not be possible to resolve this situation without doing something he’ll regret… [Written by MAL Rewrite]

Unaired anime episode bundled with the limited edition of High School DxD DX.2.

Unaired episodes included with the Blu-ray releases of Arifureta Shokugyou de Sekai Saikyou.