What type of space should be before 第?


When writing the title of a book name together with the volume number, what
type of space (if any) is usually used? (The context is the listing on a
website.)

> `\u20`: `そらのおとしもの 第01巻`

or

> `\u3000`: `そらのおとしもの 第01巻`

Should there even be a space?

