The Empty Box and Zeroth Maria: The Empty Box and Zeroth Maria, Vol. 1 (light novel)

The Empty Box and Zeroth Maria: The Empty Box and Zeroth Maria, Vol. 3 (light novel)

The Empty Box and Zeroth Maria: The Empty Box and Zeroth Maria, Vol. 2 (light novel)

The Empty Box and Zeroth Maria: The Empty Box and Zeroth Maria, Vol. 4 (light novel)

The Empty Box and Zeroth Maria: The Empty Box and Zeroth Maria, Vol. 5 (light novel)

The Empty Box and Zeroth Maria: The Empty Box and Zeroth Maria, Vol. 7 (light novel)

The Empty Box and Zeroth Maria: The Empty Box and Zeroth Maria, Vol. 6 (light novel)