In Paris, David's carefree life is turned upside down after his sister Sandrine's sudden death in a terrorist attack, leaving him to raise her seven-year-old daughter Amanda. As he struggles to cope with his own grief and provide for his niece, David finds support from Léna, a piano teacher who becomes a source of comfort and connection. As they navigate their complicated relationships and the challenges of caring for Amanda, David must come to terms with his own emotional distress and find a way to build a new life together.