Mass for the Dead Chapter 13

End of Date (逢瀬の果て) is the thirteenth main story chapter in Mass for the Dead. It was released to the public on April 1, 2021.

Episode 1: In The Fog
In the Round Table Room, while observing the crater in the Katze Plains using the Mirror of Remote Viewing, Albedo sees the corpses of the Vampire Bride s that were escorting Shalltear Bloodfallen. Since the corpses still remain that would indicate that Shalltear must still be alive. Momonga unsure if the summons died due to some accident, heads to the Throne Room with Albedo. There Momonga activates the master control of the Great Tomb of Nazarick management system. To his surprise he finds Shalltear's name is still present on the console, meaning that she is alive, but her status was now under betrayal if the readings were correct, indicating that Shalltear was under the mental influence of a third party. This only serves to confuse Momonga even more as the Floor Guardian's trip from the Northern Cave and the situation with the dead Vampire Brides don't make sense.

Albedo still viewing the mirror reports that she found Shalltear in the center of the crater in a stationary position. This only begs more questions, such as why Shalltear's brainwashers would keep her where she is if they could control her. He then realizes that the brainwashing was incomplete as no orders where given to the vampire when the mental effect took hold. Seeing that Shalltear was left behind by her attackers, Momonga is furious but quickly calms down to focus on the situation. The Overlord prioritizes his thoughts, first to identify who brainwashed Shalltear, and how as the vampire should be immune to mental effects. His thoughts drift to maybe this phenomena being the result of a talent as it is an unknown power he does not fully understand.

First Momonga confirms the details with the last people who saw Shalltear: Yuri Alpha and Lupusregina Beta. Back at the Round Table, he learns that Shalltear was being accompanied with her two summons and using [Perfect Unknowable] to return back to the tomb. This tidbit of information makes Momonga wonder if Shalltear's attackers could see through Shalltear's [Perfect Unknowable] or maybe it was by accident. Albedo at his side states that even though the circumstances are still unknown on Shalltear's betrayal, they should quickly deal with it as to prevent the risk of an information leak. Her assessment makes sense and Momonga agrees, but orders her that a priority to find the culprits and brainwashing method over dealing punishment as this situation could happen again in the future. Albedo acknowledges his orders and prepares to select people to deal with the situation. However Momonga considering that a mighty being could appear, then declares that he will be moving out as well, much to Albedo's shock.