Timid 16-year-old Jan and energetic Nina, 15, meet one day when they literally run into each other on the street. The boy’s head wound is merely the first of the injuries and joyful moments that Nina brings into his life. Discussing their unsatisfactory family situations brings the two closer together: Nina lives with her brother, father and the latter’s young girlfriend who is more a pal than a substitute mother. Jan comes from an outwardly ideal family environment, but he feels estranged and only he and his grandfather see eye to eye. He soon succeeds in filling his new friend with enthusiasm for his imaginary underwater world: a place where he takes refuge from reality. Slowly their friendship transforms into tender feelings of love; it’s not only fish that are touched by sexual longing. Together, Jan and Nina escape into a dark, quiet and safe imaginary world, but they are unable to ward off the advent of tragedy….