It's the night before the fair celebrating the Kingdom of Guardia's one thousand year anniversary. When the humans have gone to sleep for the night, excited about the next day's celebration, the monsters come out to play. Nuu and Mamo are two little monsters itching to have their own adventure in time and space, and their adventure group Nuumamonjaa is recruiting new members. Since neither is particularly strong in the brains department, their adventure turns into a disaster as they get into one mishap after another. A fast drinking competition, a close encounter with a robotic cat, and a high-speed car chase—this might be more adventure than the tiny duo bargained for!

A recap OVA that portrays the first half of the series Heavy Metal L-Gaim. After the credits, there is a short clip animated for the OVA entitled "Lady Gavlet", which is intended to be comic relief.

Objects falling from space have reduced Jinbouchou to ruins. Jashin-chan, guided by the stars, heads south to defeat Yurine Hanazono, the ruler of this violent town. When she arrives in Takamori, at the foot of the beautiful Aso mountain range, she finds... (Source: MAL News)