As an extension of Bloodshot Mode, it activates when the player is strongly provoked, it embodies their desire for victory. Significantly increases the user's speed and power in exchange for decreasing their technique and stamina.
Although Kirihara uses Devil Mode to render Inui incapable of playing in the National Tournament Finals, Inui successfully gathered data on Devil Mode and deduced how to counter it. Inui later recorded that he observed Devil Mode causes the user's mind to decay and has life threatening effects when overused, which he disclosed to Yanagi to inform the rest of the Rikkai team. Rikkai would then discourage its use by Kirihara, who sought to find a stronger mode without the side effects. This would result in Kirihara achieving Angel Mode.
First used by Kirihara in Genius 358.