Shiori Hirose/Missing Ace

Shiori Hirose (広瀬 栞) is a twenty-five-year-old woman who previously aided the B.O.A.R.D. Riders.

Missing Ace
In an alternate reality where Blade sealed the Joker Undead, Shiori was trying to prepare for her marriage but when a new threat surfaces, she decides to put aside her ideal life and helps the Riders once again by revealing the true identity of Albino Joker Undead. She was last seen celebrating Amane's birthday at the Jacaranda Cafe.