14-year-old Ann has been brought to her mother’s hometown in Shimane Prefecture to start a new life following her parents’ bitter divorce. But when her mother tragically commits suicide, Ann, feeling abandoned and alone lashes out in anger, throwing a precious sand clock her mother had given her at her funeral altar. Coming to Ann’s rescue is classmate, Daigo, who repairs the sand clock and makes a promise to her saying, “I’ll always be with you, okay?” The two become a couple all through their middle school years until Ann leaves for Tokyo to live with her only remaining family member; her father. Ann and Daigo attempt to continue their relationship at a distance but Ann is increasingly tormented by memory of her mother’s death, leading her down a path of self-pity and recrimination. Though she believes Daigo to be her destiny she also worries that she is placing too much pressure on him and may ruin his life, and ultimately decides to break up with him. 11 years later, Ann returns to Shimane to announce her engagement to another man, but is reunited with Daigo, and her heart starts to waver. As the wedding date approaches, Ann finds herself still gazing at her sand clock.