Kuromukuro (クロムクロ) is a Japanese mecha anime television series produced by P.A.Works, directed by Tensai Okamura and written by Ryō Higaki, with character designs by Yuriko Ishii and music by Hiroaki Tsutsumi. The series was produced to celebrate P.A. Works' 15th anniversary. It follows a student of Tateyama International High School named Yukina Shirahane and a young samurai named Kennosuke Tokisada Ouma, who was born in the Sengoku period and reawakened in the present day inside a mysterious artifact called the Cube. When an extraterrestrial force called Efi Dorg invades Earth with a mission to collect all the fragments of an artifact called the Pivot Stone in order to achieve planet domination, Kennosuke pilots a stolen Efi Dorg mecha dubbed the Black Relic, with Yukina biometrically sy