Mai, who had lived as part of a single-parent family for years, finally sees her mother remarry later in life and moves in with her new husband. Economically stable and kindly toward her, Mai's new stepfather tells her, "Think of this as your own home—feel free to live however you like." Yet, the middle-aged man occasionally shoots her glances filled with obvious sexual undertones. Though confused, Mai endures it with quiet resilience, wishing only for her mother's happiness. Then one night, an incident occurs in the bedroom...