After her sister's husband falls ill, Saki (Jun Kusanagi) takes in her nephew, Shinya. Her days are filled with constant arguments between her husband and his younger brother, leaving her overwhelmed by stress. Seeking a temporary escape from the turmoil, she decides to take Shinya—a boy she's doted on since childhood—on a trip to find brief peace. During their journey, the two grow closer, bonding through time spent in nature. Emotions begin to stir between them, eventually leading to a forbidden relationship. Craving each other's bodies, they cross the line into taboo intimacy, forging a new and illicit connection.