Kaitou Tenshi Twin Angel: Toki to Sekai no Meikyuu

Haruka and Aoi are friends who transform into the magical Twin Angels to fight evil as the Red and Blue Angels. Their plot relies mainly on locating and defending the Seven Amulets, magical jewelry items capable of generating great power when assembled by a mysterious figure known only as the Black Trader and his subordinates. Kurumi, the White Angel, ultimately joins them.