The Empty Box and Zeroth Maria, Vol. 7 (light novel)
Utsuro no Hako to Zero no Maria
Bok av Eiji Mikage
Kazuki and Maria are still trapped in the vicious world of "Kingdom Royale," a game where murder seems to be the only path to victory. Kazuki swears he will find a way out of this particularly cruel Box, but first, he must discover the truth behind it...