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)+ More
Characters & Voice Actors

Ai
Main
Color, Alice
Supporting
Dmitriyevich, Julie Sakuma
Supporting
Hambart, Hampnie
Supporting
Hana
Supporting
Scar
Supporting
Stratmitos, Dee Ensy
SupportingRecommended for you
Odd Taxi
TV
23m
Scissor Seven 3rd Season
ONA
15m
Dragon Raja
ONA
22m
Spare Me, Great Lord!
ONA
24m
Fate/Grand Carnival
OVA
30m
Assault Lily: Fruits
ONA
3m
Chang'an Magic Street
ONA
14m
Xue Ying Ling Zhu 2nd Season
ONA
19m
Arknights: Holy Knight Light
ONA
9m
Orient
TV
24m
The Eminence in Shadow
TV
23m