The ambition of Celine Song’s “Materialists” — her romantic comedy-drama starring Dakota Johnson, Chris Evans, and Pedro Pascal — is apparent from the first frame. Shot on 35mm film, the movie opens with a towering wide shot not of modern-day New York City, but a verdant forest, where we watch two cave people fall in love.

Watching the new unromantic non-comedy “Materialists” can feel like going on a shaky first date. There’s something off.