Childhood friends Isuzuzuki Rin and Yuuki Karen are always together, yet they only seem to fight when they open their mouths... But the two are also connected by a secret relationship with those around them. They are fighting day and night against an enemy known as the 'Dead', who targets the weaknesses of the human heart and drives people into despair. Though they make a mismatched pair, they understand each other well, and suddenly a mysterious transfer student intervenes, an enemy who knows Rin's body secrets appears, and a girl who has feelings for Karen shows up in their school life!? A tumultuous and stylish duo action of Rin and Karen begins!