Widow Orié lost her husband in an accident last year. She lives with her only son, Masaki, who quit his job and became a recluse after his father's death. Orié has been supporting and worrying about Masaki ever since. However, both of them were aware that even before her husband's passing, they had begun feeling attracted to each other as man and woman. One day, Orié invites Masaki on an onsen trip together. During this journey, their relationship takes a new turn.