NA Localization:
A mysterious creature born from the Holy Grail going berserk... And now there's a version that has taken a fancy to the cha-no-yu!?
After having tea served to them by a certain tea master, they learned of wabi and sabi, and now they look like they're carrying themselves more gracefully and elegantly than usual. It may be just the mind playing tricks, but they honestly seem a little smarter too.
Actually, they looked different originally, but in an effort to survive in the strange land in which they found themselves, they discarded their identities and adapted, ultimately coming to look as they do now.
Fan Translation:
A version of the mysterious creatures born from the Holy Grail going rampage, but knocked into its sense by tea ceremony?
It came to know wabi and sabi through the tea given to it by a tea master, even its usual heartless behaviours have become more beautiful. It could be my imagination but it also seems to be more intelligent as well.
It is said that it used to have a different appearance, however, to survive by itself in a land it got lost into, it has thrown away its identity and ended up like this.