Mwarr! This episode was good. I like flashback episodes! Didn't understand why that skeleton went bonkers because of the ketchup-trap but I suppose there will be some good explaination in the next episode.
Shana teaching Yuji how to eat melon-bread was really cute! Due to this anime I've been trying to find melon-bread in my local supermarket. I failed...
By the way, what does "de arimasu" mean?