There are films that take you places you rather wish they wouldn’t. Within the first 10 minutes of “Siblings of the Cape,” I was ready to stop watching, but something about Shinzo Katayama’s scruffy, transgressive debut kept me hooked.

While it’s hard to give an unconditional recommendation for a movie about a disabled man who starts pimping out his severely autistic sister, Katayama is definitely doing something right here. Working from his own script — and paying out of his own pocket — he shows little interest in staying within the bounds of conventional taste; as depictions of mental disability go, this is closer to Lars von Trier’s “The Idiots” than Netflix’s “Atypical.”

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