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The new semester begins, and the new daily life of high school begins again... No, Hoshino Kazuki is still living an "extraordinary" life - there is a blank segment in his memory! What's more, there were many groundless accusations against him, and his friends left him one by one. Hoshino Ikki fell into an unprecedented state of isolation... Maria judged that this was the work of the "box", so she adopted strong but effective means to pursue the truth, and finally discovered that the initiator of all this was actually related to herself...

Daiya Omine suddenly stopped coming to school, and his whereabouts were unknown. Until Daiya appears again, Ikki discovers that his friend not only got the "box", but also used the "box" to create a survival game that requires players to kill each other. Ikki was forced to get involved in this game, and at the same time discovered that Maria and several top students in the same school had also become players. After the game started, everyone had to guess, frame, and kill each other in order to save their lives and become the final winner of the game. Only Ikki and Maria couldn't bear to attack their companions, but if they didn't kill, they could only wait to be killed. Faced with this life-and-death problem, the choice Ikki and Maria made was-?!

All kinds of strange phenomena suddenly appeared in the seemingly peaceful city: sometimes there were "dog men" taking to the streets, and sometimes groups suspected of emerging religions appeared, and all of this was related to the "box" in Daiya Omine's hand. On the other hand, after learning that Daiya was using the "box" to do some irreparable things and try to harm Maria, Hoshino Kazuki decided to activate his own "box" and retaliate against his friend. However, just as the "box" battle between the two entered a tense stage, a mysterious figure suddenly appeared. This person's appearance was almost exactly the same as Otonashi Maria. Who is "she"? Can Daiya and Ikki's friendship be restored? Where will Maria's fate go?

Daiya Omine planned to turn others into his puppets and rule the world, so Ikki created a box called "Screen of Destruction Desire" and imprisoned Daiya. When Daiya Omine's "life" ended in this space, he was completely defeated. Unexpectedly, Daiya had another plan and dragged Ikki into the cinema. The two faced off head-to-head. Who was going to change the "world"?

The country deposed the king for the fourth time, and this time it is Hoshino Kazuki's turn to be the player. Before the game started, he made an agreement with the "owner" of the "box": if this game can last for eight days without a dead person appearing, then the game must stop. In order to achieve this goal, Ikki participated in the game with unprecedented enthusiasm. He must be careful and step by step to create an environment where no one loses his life. Just when he thought he had seen the dawn of victory and was about to reveal the secret of this "box", he didn't expect that there was another unknown "owner" of this box.