Protocol of the Two-sided Gospel: X-Day Protocol
|Romaji Translation:||Sōtsui Fukuin no Purotokoru|
|Release Date:||April 26, 2018|
|Director:|| Kenichi Kawamura
|Ending Song:||LAST GAME|
|Previous:||Episode 02: Epigraph of the Closed Curve: Closed Epigraph|
|Next:||Episode 04: Solitude of the Mournful Flow: A Stray Sheep|
As Mayuri Shiina prepares for a Christmas party for everyone at the lab, Rintaro shows Amadeus Kurisu – who he keeps a secret from his friends – around Akihabara and the lab. On Christmas Eve, Leskinen and Maho end up joining Rintaro to the party, which proves to be more than a surprise when Suzuha assumes it is an ambush and almost attacks Yuki. While everyone else enjoys the party, Mayuri overhears Rintaro speaking happily with Amadeus Kurisu, prompting Maho to step in and remind him that the real Kurisu is still dead, inadvertently sending him into a shock.