Grieving the three-year anniversary of her husband's tragic death in an accident has left Akane Soma adrift in sorrow. As her daughter and son-in-law return home to find their mother navigating loneliness—a loneliness partially eased by a beloved pet bird—Akane’s quiet life begins to shift. Her daughter remains delightfully naive and oblivious to others' feelings; conversely,
the attentive son-in-law is always there to offer comfort and support. When Akane nearly loses her cherished bird to flight while reaching for it in distress over her late husband’s memory (a loss she keeps hidden from her children), a deeper current stirs within her heart. Slowly but surely, she realizes her profound affection isn't just maternal; it's romantic love blossoming for the caring man who has awakened a fiery womanly instinct inside her.
This burgeoning desire explodes when Akane catches him masturbating alone in the living room because his wife refuses intimacy. Seeing him so vulnerable ignites her long-suppressed lust, confirming that she loves him completely and wishes to give him every piece of herself. He reciprocates with equal devotion, cherishing the gentle, empathetic mother-in-law above all else. Just as they are reconnecting, their little bird returns home, symbolizing the enduring bond between them—a promise that no distance can sever.