Between Yukiko and her best friend Maki lay a deep secret they could never reveal to anyone. The secret was that Maki had once caused the death of her own lover. Confronted with this incident, Yukiko accepted Maki completely and took upon herself the heavy burden of covering up the truth. Their bond was sealed by a solid friendship forged to conceal this dark reality, and nothing more was ever spoken of it. Yet, would this secret eventually come to light?