In 1996, MR-G debuted with a full metal exterior while maintaining the shock-resistant performance that is at the core of G-SHOCK. Since then, MR-G has continued to evolve its performance and functions, while at the same time thoroughly refining its exterior and developing a look befitting the pinnacle of the G-SHOCK line. MRG-G1000B-1A4 "Akazonae" released in 2017 is a further sublimation of this creativity. It was inspired by the armor worn by samurai-warrior in a period in Japanese history of near-constant civil war, social upheaval, and political intrigue from 1467 to 1615, and the red color, a symbol of strength, was expressed in the traditional Japanese color of deep red "Kokibeni" to show the toughness of G-SHOCK. The brave and luxurious look of the G-SHOCK watches was a big hit not only with G-SHOCK fans but also with mechanical watch enthusiasts.
The next model to be released was the MRG-B2000B-1A, named "Kachi-iro". The design of this model is accented with the "Victory Color", a color that has been familiar to the Japanese people since ancient times, when it was used in armor to boost the morale of samurai warriors. In addition to using traditional Japanese colors, the details of this model were also designed to express the gorgeous and powerful atmosphere of armor from the Edo period onward. The creativity of this model also helped to promote the value of "Japan-made" products manufactured at Yamagata CASIO.