Gundam Build Fighters (Japanese: ガンダムビルドファイターズ, Hepburn: Gandamu Birudo Faitāzu) is a 2013 Japanese science fiction anime television series based on Sunrise's long-running Gundam franchise. The series is directed by Kenji Nagasaki of No. 6 and written by Yousuke Kuroda of Mobile Suit Gundam 00. Character designs were done by both Kenichi Ohnuki and Suzuhito Yasuda. The series was first unveiled under the name "1/144 Gundam Mobile" project by Sunrise, before its official announcement. In contrast to other Gundam series, Gundam Build Fighters focuses on the Gundam model (Gunpla) aspect of the franchise. The first opening theme "Nibun no Ichi" (ニブンノイチ, lit. "One Half") by Back-On, and the ending theme "Imagination > Reality" by AiRI were used from episodes 2 to 13. From episodes 14 to 24, "wimp" by Back-On featuring Lil' Fang (from FAKY) was the opening theme while "Han Pan Spirit" (半パン魂（スピリット）, Han Pan Supiritto, lit. "Short-Pants Spirit") by Hyadain became the ending theme from episodes 14 to 25.