A version of the Fifth Fuyuki War where nobody wears any clothing. At least not the Masters or Servants.

"It is not uncommon that some types of Ritual Magic must be carried out au naturel, even if the working has no aspects of Magic to it. The reasons for this vary, whether because it is "closer to nature" or the clothing somehow getting in the way, but getting nude is a common way to indicate that magic is about to happen. While it understandably occurs in most Magic (if only for practical reasons), it could be a part of nearly any type of ritual spell-casting."

"Often associated with a Witch Classic, though other types of mages may have reasons to do this. Could involve a Nude Nature Dance, especially if the ritual is conducted by a group."

"The term skyclad — meaning "wearing only air" — is often applied, especially in recent works. While nudity has long been associated with magic and witchcraft, this word actually comes from modern neo-paganism, specifically the mid-20th century works of Gerald Gardner (the founder of Wicca). Gardner probably got the term from a direct translation of the Sanskrit word Digambara (literally "sky-wearing"), referring to a sub-sect of Jainism in which monks are discouraged from having any possessions, including clothing." - TV Tropes.

All characters involved are at least 18 years old.