OVA: Beneath Cherry Blossoms in Full Bloom Darker Than Black: Kuro no keiyakusha : Season 1 Episode 26

As the cherry blossoms bloom, so does Otsuka's fascination with a heroic masked man who appeared to her within a strange dream. She creates a character based on the mysterious figure to include in her popular fan fiction - but the wrong people might be reading her stories. Within the Contractor underground, intrigue and murder surround a stolen chemical. When the pages of Otsuka's work reveal details that point to the coveted substance, BK201 might be forced to write the final chapter of the young author's tale.