Blu-ray disc bundled with the fourth volume of the manga.

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!

The story takes place during a conflict between the Krakozhia Dukedom and the Grania Republic. In the midst of the fighting, a savior appears to the Krakozhia Dukedom, and it is a high school student named Yano Souhei. Two female soldiers, First Lieutenant Ruto and Second Lieutenant Haruka, appear in tanks to intrude on Souhei's everyday life, followed by the enemy soldier Shachirofu, all of whom use firearms without hesitation at his house. (Source: ANN)

Anime based on Otaku no Seiza: in Another World, on the Turbo CD, and Otaku no Seiza: An Adventure in the Otaku Galaxy, for the NES, which were two Role-Playing games, published by M&M, released in Japan in 1991 and 1993.