Prologue
Synopsis
Having received a secret message, Hisao secretly meets its sender, Iwanako in a wintry forest. After exchanging pleasantries, Iwanako asks Hisao out, to which he responds by nearly dying in a fateful heart attack. Recuperating later in hospital, Hisao mulls over the change in his life so far, but is interrupted by the announcement of a greater change: his parents suggest that he attend Yamaku Academy so that his heart condition can be best cared for.