Linebarrels of Iron is a Japanese manga series created by Eiichi Shimizu and Tomohiro Shimoguchi. The series was first serialized in Akita Shoten's monthly seinen manga magazine, Champion Red, in 2005. It has since been compiled into 24 tankōbon, as of October 20, 2014. The story centers on Kouichi Hayase, a fourteen-year-old boy living a mediocre life, until an accident turns him into the pilot of a gigantic robot called "Linebarrel" and leads him to encounter a mysterious girl.

Mamiko Noto is a Japanese actress and singer. Some of her prominent anime roles include Kotomi Ichinose in Clannad, Rin in Inuyasha, Kotori Monou in X, Aoi Kannazuki in Kaitō Tenshi Twin Angel, Durandal in Honkai Impact 3rd, Haruka Nogizaka in Nogizaka Haruka no Himitsu, UMP9 in Girls' Frontline, Fiel Nirvalen in No Game No Life, Sawako Kuronuma in Kimi ni Todoke, and Satellizer L. Bridget in Freezing. Noto was nominated in the 1st Seiyu Awards for her work as Yakumo Tsukamoto in School Rumble and as Masane Amaha in Witchblade, and she was one of the recipients of the Best Supporting Actor Award at the 18th Seiyu Awards. Noto has released several character songs and albums which have charted in Oricon and was a guest at the Otakon and Anime Expo conventions held in the United States.