Shiguru Oshikiri was originally a famous actor and skilled swordsman known for his tremendous acting ability and cool demeanor. He was chosen by the Blue KiramaiStone to be a Kiramager for his skill at swordfighting and joined the Kiramagers in fighting against the Yodonheim.
During the battle against Vise Jamen, when Shiguru Oshikiri got a vise stuck on his head and was rendered unable to transform. Despite Shiguru's attempts to put up a "cool" act for his movie, as soon as he is alone he starts crying out in pain and accidentally reveals to Juru and the other Kiramagers how much the pain is hurting him. Despite this, Shiguru refuses to back down from starring in his movie and presses on. Later, when the Kiramagers are battling against the Vise Jamen and his Bechats, Shiguru attempts to join the battle too despite not being able to transform. To prevent Shiguru from getting himself injured, Juru convinces Shigeuru to stay behind and not go into battle until he is able to transform again, telling him it would be a great introduction similar to the role of the samurai he is playing in the movie he is filming. After the Kiramagers use the handle on Vise Jamen's head to free Shiguru from the Vise, Shiguru transforms into Kiramai Blue and duels the Vise Jamen one on one. After defeating the Vise Jamen, KiramaiBlue joins his comrades in fighting against the Jamen Beast Vise Sherga. The five Kiramagers combine their Mashins to form Mashin Gattai Kiramaizin and destroy Vise Sherga.