The Empty Box and Zeroth MariaFanfic, x Reader & AI Roleplay

The Empty Box and Zeroth Maria, known in Japan as Utsuro no Hako to Zero no Maria, is a Japanese light novel series written by Eiji Mikage with illustrations by Tetsuo. It was published by ASCII Media Works under the Dengeki Bunko imprint in seven volumes, and is colloquially referred to as Hakomari.

The story unfolds around a sense of unease that creeps into everyday life, with the elements of the "box" and the "Zeroth Maria" from the title giving the work its distinctive atmosphere. Across the series, the relationships and events involving the characters build up over the course of the volumes.