The Empty Box and Zero Maria. Book 2

Kazuki Hosino broke free from the world of repetitions and met Maria Otonashi again. But the ordinary life of teenagers will not last long - strange things start happening to Hosino again.
Confessions of love that he didn't make, actions he didn't take, lapses in memory… And then a declaration of war via mobile phone!
“I will destroy you. I will destroy what you hold most dear. I received the box, and now I will take everything from you.”
But what did Kazuki do to the owner of the box? Why is Hosino so hated by him?..