Pithamagan whirls around four characters. Chithan (Vikram) who is orphaned at a young age, devoid of all human contacts lives on his animal instincts and ekes out a living as a graveyard caretaker.He seems to exhibit behaviour consistent with autism spectrum disorders. Gomathy (Sangeetha), a petty ganja seller, who pities Chithan’s condition, gets him a job at the ganja fields of the main villain.
Nathan Algren is an American hired to instruct the Japanese army in the ways of modern warfare -- in this lush epic set in the 1870s, which finds Algren learning to respect the samurai and the honorable principles that rule them.
Four boyhood pals perform a heroic act and are changed by the powers they gain in return. Years later, on a hunting trip in the Maine woods, they're overtaken by a vicious blizzard that harbors an ominous presence.