One day, Kazuki Hoshino, an ordinary high school student who values his everyday life above all, has a dream. In it, a person of indeterminate appearance and gender appears to him. They offer him a box that grants any wish. There are no limits—one only needs to believe sincerely. A strange dream and a strange person. And then, on the most ordinary, gloomy day of March 2, a new girl named Aya Otonashi is transferred into his class. For some reason, she seems familiar to him. Straight away, she heads toward Kazuki and declares that for her this is already the 13118th transfer to this school—and she’s had enough of it. So she declares war on him, whatever that may mean…