The Empty Box and the Zeroth Maria(空ろの箱と零のマリアUtsuro no Hako to Zero no Maria), also known as Hakomari(箱マリ) for short, is a Japanese light novel series written by Eiji Mikage, with illustrations by Tetsuo. The first volume was released on January 7, 2009. Currently, there are 6 published volumes published by ASCII Media Works under their Dengeki Bunko label.