第 3 集: 倫太郎帶領阿瑪迪斯·桐生葛瑞絲遊覽秋葉原，同時牧瀨紅莉棲籌備實驗室聖誕派對。
2018年4月26日 播出
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, at which point Rintaro feels a strange sensation. (Source: Wikipedia)