A sibling rhythm that feels natural

“Hal & Harper,” which premiered Sunday on the cinema-centric streamer Mubi, is a gorgeous, generous limited series that has nothing to show you other than people, how they are and how they do or do not get along. Its elements are not unfamiliar, because they're drawn from life, rather than from the movies —or just from the movies, as they're subjects to which the movies have often turned.

- ROBERT LLOYD

CREATOR Cooper Raiff and Lili Reinhart in "Hal & Harper," streaming on Mubi.

Mubi

But, like this year’s “Adolescence,” which it (differently) resembles in its mix of naturalism and artifice, the series, written and directed by and starring 28-year-old Cooper Raiff — writer-director-star of the indie features “S—house” and “Cha Cha Real Smooth” — demonstrates that something fresh can still be done in an oversaturated medium.

While the story spreads out over eight episodes, the cast is compact. Harper (Lili Reinhart) is the daughter of Mark Ruffalo's character, credited only as "Dad"; Hal (Raiff) is her younger brother. Alyah Chanelle Scott plays Jesse, Harper's longtime girlfriend; Havana Rose Liu is Abby, Hal's shorter-time girlfriend; Kate (Betty Gilpin) is Dad's girlfriend. The company is completed by Audrey (Addison Timlin), divorced with two small children, who shares an office with Harper, and Hal's roommate, Kalen (Christopher Meyer).