When Tao Okamoto first read the script for Ryusuke Hamaguchi ’s  All of a Sudden , one scene told her above all others that this was hers for the taking. The sequence saw her character, a well-regarded playwright named Mari, explaining the systemic failures of modern capitalism. The monologue is long and complex, propelled by interconnecting arguments that, on the surface, might resemble an academic paper; it’s complete with her drawing whiteboard graphics to illustrate and summarize her points.  “This is something that I’d been thinking about over the years — and I got to lecture people on it in the movie, it’s amazing,” Okamoto says. “I think it will help a lot of people to connect the dots. I don’t think I’ve ever seen any movie explain and verbalize the system of capitalism and where we are like this.” Of course,  All of a Sudden  is not an academic paper.…