At St. Cherine School, Haruka Minazuki and Aoi Kannazuki are ordinary classmates by day and the Phantom Thief Angels TwinAngel by night. Working alongside Kurumi Hazuki, Tesla, and Nine, they fight the criminal organization known as the Black Fund. After recovering the stolen artifact "Tears of an Angel," they find it taken again almost immediately. Pursuing it, they encounter two Phantom Thief Angels they have never seen before — and begin to uncover the secret behind TwinAngel's origin.