The Night Before Special: The Long-Awaited Utopia

Episode 0 of Monsuto Anime. It is the first item in the franchise to be completely animated in CG.

The big threat is passed, but the gang's still got little threats to handle. The monsters are becoming a part of daily life, but there's one big thing missing: Oragon. One day, a powerful monster appears in the middle of town. It's got Oragon inside!

(Source: Crunchyroll)