The Empty Box and Zero Maria. Book 3

This time, Kazuki Hoshino and Maria Otonashi, along with other students, found themselves caught up in the role-playing game «Overthrow the King». All participants were assigned medieval character classes and were told that the only way to survive and become the winner was to kill each other.

What silly rules are these? And who even came up with such a wish? Could it be that Kazuki's classmate and friend, Daya Ominé, who hasn't been seen at school or home for a long time, is involved in all this?...