Gundam Build Fighters: Steel Builders

Gundam Build Fighters: Steel Builders (ガンダムビルドファイターズ: 鋼のビルダー, also known as GBF:SB) is a Japanese science fiction 12-minute anime web series based on Sunrise's long-running Gundam franchise. The series serves as a spin-off to the Build Fighters series.

Summary
A trio of three young Gunpla Builders who took many Gunpla Battles with only using physical weapons.

Characters
Steel Builders
 * Kenji Tsukiyama
 * Ringo Akisawa

Supporting characters

 * Crank

Steel Builders

 * ASW-G-08/K Gundam Barbatos Kenji custom
 * EB-06/AS Graze Kenji custom
 * EB-05s/R Schwalbe Graze Ringo custom

Production
Asako Nishida (Love Live! School Idol Project) serves as the main character designer of the series, rather than Kenichi Ohnuki & Suzuhito Yasuda.

Yuki Hayashi will compose the music for the series, along with Masaru Yokoyama.