A mother finally tells her son the truth about the vampire she chose to love. The story of how Midori and Tamaki met is not a flashback, it's the answer to every question Yuuki never knew to ask. This OVA exists to break the premise of the entire series in the most human way possible: by showing that the line between human and devil was never the point.
Yuuki returns home to visit his mother, Midori, and she decides the time has come to share a story she's kept buried for two decades. Through her account, a tender and dangerous romance unfolds between a human woman and Tamaki, a devil navigating a world that sees his kind as monsters. Their connection blooms against impossible odds, painted against a backdrop of secrecy and fear. As Midori recounts how love transcended the boundary between human and supernatural, Yuuki begins to understand the sacrifices that shaped his own existence. The episode balances intimate character moments with the supernatural tension that defines the series, revealing how compassion and vulnerability can exist alongside violence and danger. What emerges is a story about choosing love when society demands rejection, and the quiet courage required to build a life with someone the world tells you to fear. This glimpse into the past reshapes how viewers see both Yuuki and his family's position within the larger conflict between humans and devils.