Murakami and Kuroneko met as child with the common interest of astronomy. Years after a tragic accident where the second one dies tragically, Murakami is in high school and the only member of the Astronomy Club. One day at the classroom arrives a new girl pshysically similar to Kuroneko who wants to join the Astronomy Club. She confesses to Murakami that she can predict the future and tells him that if he takes the bus from the observatory that he visits regularly; he is going to die...