Amidst Kouno Jun's blissful life, his love story takes a dark turn. He is infatuated with Hasebe Rino, the most beautiful girl in his kindergarten class. Kouno confesses his passionate love to her, only to have her disappear without any reason despite sharing his feelings. Confounded and lost, Kouno seeks answers but his classmates cannot remember her. Thus, he clings to Hasebe's memory alone.
As he reaches his teenage years, Kouno sinks into sorrow and despair. A glimmer of hope appears when Hasebe reappears, but she is not the same girl who stole his heart...
