Rémi Delescluse's partner will soon give birth to a girl. As the happy event approaches, the future dad suddenly realizes that a void is coming to the party: "My daughter already has a part of this man in her and I know absolutely nothing about him," observes. does he. He is the anonymous donor whose sperm was used for artificial insemination of Rémi’s mother. The desire to humanize this man, but also to know his medical history, half of his genetic heritage being unknown to him, pushes the director to go in search of his origins in a film in the form of an overwhelming and instructive private diary filmed.

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