A Google search of “athletics in India” reveals the not surprising fact that cricket is the most popular sport in the country. Chess, hockey, soccer, and tennis are also widespread. On Wikipedia’s “Sports in India” page, one must scroll past 26 other pastimes before arriving at baseball. Curiosity is naturally piqued by the knowledge that Mirra Bank’s new documentary film, “The Only Real Game,” is not only about baseball in India, but about the sport’s popularity in Manipur, a remote, isolated state on the Burmese border that is virtually closed to foreigners.