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March 2nd - the day when the semester was about to end, a mysterious beautiful girl suddenly transferred to Hoshino Kazuki's class. Originally, this girl should have had nothing to do with him, but the first thing she said was "Hoshino Ikki, I'm here to destroy you." What's going on? Not only that, Ikki was later told that the world they lived in was constantly repeating "March 2nd", and his mission was to find out the root cause of this repetition with Maria. After some experimental exploration, they discovered that it all originated from a "void box"...