DARKER THAN BLACK: Kuro no Keiyakusha - Sakura no Hana no Mankai no Shita

Darker than Black: Beneath Cherry Blossoms in Full Bloom

A side story of Darker than BLACK, also known as Episode 26. A Contractor was killed and it was rumored that his corpse and possessions were buried under a Sakura tree. Hei and the others (including the Police) decide to investigate.