A sudden turn in the mood.
We start with Buchio going on a trip to Jolly Old England, which is well populated by its own mythological inhabitants, and 70% covered by power points, or ley lines so that anyone who studies can wield magic there, but only there.
Then everyone starts talking about how quickly humans die compared to yokai, and humans are always asking the yokai to take care of their loved ones after they pass on. In fact, Wagen-san likely came into being after the dying wife asked it to take care of her husband.
The story between Jiro and Mu-chan's grandmother in the mysterious photo is revealed.
WW2 is there, but not named. Japan's role isn't discussed. Mu-chan's grandfather dies in the unnamed war.