When a developmentally delayed man named Shonzi moves in with his brother Todd and his girlfriend Lindsay, he becomes obsessed with Lindsay and begins to cause tension in their relationship. As Shonzi's behavior becomes more erratic, Todd must confront his own feelings of guilt and responsibility towards his brother, and decide whether to be honest with Lindsay about their past or risk losing her. Set against a backdrop of quirky obsessions and family drama, Rainbow Time is a heartwarming and hilarious exploration of love, family, and acceptance.

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Some movies that have similar genres and were produced around the same time as Rainbow Time include Delivery, Parasite, War Dogs, Demolition, The One I Love, Cider with Rosie.