空ろの箱と零のマリア [Utsuro no Hako to Zero no Maria] Series by Eiji Mikage

Kazuki Hoshino leads the easy-going life of a typical high school student--until the appearance of a new girl in his class turns his world upside down! Introducing herself with a promise to "break" Kazuki is abnormal enough to make an impression, sure, but why does she seem so familiar...?

When your world comes crashing down around you...who can you turn to?Nothing is more important to Kazuki Hoshino than his normal, everyday life. But his friends are accusing him of committing offenses he doesn't remember, and his closest relationships are crumbling one by one. Soon, the life he knows will vanish forever.If a box is involved, as he suspects, Maria is his most valuable ally...but how will he keep from losing her, too?

(Volume 1)Kazuki Hoshino leads the easy-going life of a typical high school student--until the appearance of a new girl in his class turns his world upside down! Introducing herself with a promise to "break" Kazuki is abnormal enough to make an impression, sure, but why does she seem so familiar...?

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...

(Volume 1) Kazuki Hoshino leads the easy-going life of a typical high school student--until the appearance of a new girl in his class turns his world upside down! Introducing herself with a promise to "break" Kazuki is abnormal enough to make an impression, sure, but why does she seem so familiar...?

"I couldn't care less what happens to me. All I've ever wanted is for you to be happy."The Silver Screen of Broken Wishes was a Box intended to stop Daiya's plan to rule the world-a theater to show him his past and destroy his wish. Unfortunately, Daiya isn't one to go down so easily, and "Aya" Otonashi is the key to his plan to drag Kazuki into the theater and defeat him. Will Daiya succeed in changing the world-or will someone be able to save it from him?

In the final volume of The Empty Box and Zeroth Maria, Kazuki makes his last stand against O to fulfill his vow to bring back the "zeroth" Maria-the real Maria. But what does fate have in store for them...?