Urarochi Diamond
Genres: Adventure
Type: OVA, Episodes: 1
Aired: Dec 21, 2001
Studio: Studio 4°C
Source: Unknown
Rating: PG-13 - Teens 13 or older
Synopsis:
Uraroji Diamond is a very interactive DVD which takes you inside a Studio-4C-style town with all the weirdness inside, while you scour for episodes (very short, black and white, weird episodes).

(Source: AnimeDB)