It's a Rumic World: 50th Anniversary Weekly★Shonen Sunday
Genres: Comedy, Sci-Fi
Type: Special, Episodes: 1
Aired: Jul 30, 2008 to Aug 11, 2008
Studio: Sunrise
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
The characters from Ranma 1/2, Urusei Yatsura, and Inuyasha all gather together in a short crossover to introduce the 50th Anniversary Weekly Shonen Sunday "Rumic World" Museum opening, celebrating Rumiko Takahashi's manga work.