Gundam Build Fighters (ガンダムビルドファイターズ, 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,[1] before its official announcement. In contrast to other Gundam series, Gundam Build Fighters focuses on the Gundam model (Gunpla) aspect of the franchise.[2] 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)[3] 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[4] became the ending theme from episodes 14 to 25.