Kobushi Kuroi (ろい こぶし, Kuroi Kobushi), also known as "Black Fist", is a young thief and an Esper with the power of invisibility. She is a thief known for her misdeeds announced in advance. She is a very good boxer and loves fighting policemen mixing her invisibility ability and her boxing skill. She has a great ego and hates losing a fight. After being saved by Rindo, she adores him deeply, calling him her "Prince" and starts staying with Rinka, much to her dismay.