Model Suit Gunpla Builders Beginning G is an original video animation series produced by Sunrise to celebrate the 30th anniversary of the Gundam plastic model kits. It's directed by Kou Matsuo and written by Yousuke Kuroda, and features character designs by Kaichiro Terada. The OVA was released in August 15, 2010 to December 19, 2010 with 3 15-minute Episodes. Unlike other Gundam titles, Gunpla Builders Beginning G takes place in a present-day timeline.

Aside to the OAV, two manga sequels were released in Dengeki Hobby Magazine.

After intense fighting, the GUNPLA Battle U.S. Championship enters its final round. Here, the figure of a certain fighter appears. A few months later Satsukino Misa, building a new GUNPLA in the Ayato Shopping Street, seems to be in a worse mood than usual. As an outlet for her unfocused anger, she sets her completed GUNPLA in a simulator and enters battle, but the GUNPLA is suddenly restrained. On the eve of the huge GB Festa event, the fates of the GUNPLA Fighters are at a critical juncture.