Kamisama no Inai Nichiyoubi: Kioku
English title: Sunday Without God: Memories
Japanese title: 神さまのいない日曜日 第13話 「記憶」
Type: Special
Episodes: 1
Source: Light novel
Genres: Fantasy, Mystery
Studios: Madhouse
Duration: 23 min
Rating: R - 17+ (violence & profanity)

Episode 13 of Kamisama no Inai Nichiyoubi, included in the final Blu-ray/DVD volume of the series.

This bonus episode is separated into three parts.

In the first part, taking place before the characters reach Ostia, Ai and the others visit a hot spring.

In the second part, Alice remembers the times he killed his classmates and encounters Hampnie Hambart. A battle ensues.

In the third and final part, Hampnie dreams of when he first met Hana and is then woken up by Ai.

(Source: Wikipedia)