The Empty Box and Zeroth Maria, (Light Novel) Vol. 04

Kazuki Hoshino is still trapped in the cruel game of Kingdom Royale, where players have to fulfill the victory conditions of the roles they are assigned-which nearly always means killing the others. But this time, he has a plan to take charge and break everyone out once and for all. Unfortunately, the key to his success is Daiya, the trickiest one of the group. Before Kazuki can end the game, he must discover the truth behind it...