Rinpu appears as a minor character in BUILD-DIVIDE -#FFFFFF- CODE WHITE, consistently defined by wearing a mask. He has an older sister, Reira Kanagi, who serves as a guard. During events in episode 20, Rinpu witnesses Reira challenge the antagonist Higuma but finds himself confused by her motives for the confrontation. Higuma implies Reira has battled him before, hinting at a history potentially unknown to Rinpu. Rinpu's reaction underscores his lack of understanding regarding Reira's true intentions and her past conflicts with Higuma. In their encounter, Reira reveals details about her employment as a guard and her reasons for fighting Higuma, providing context to her relationship with Rinpu.