Pichaikkaran revolves around Arul Selvakumar, who's a rich guy of the city. One day, he realizes that his mother's life is at stake and can't be easily saved. He then happens to meet a Swami who suggests him to give up all his pleasures and live as a beggar for 48 days, without revealing his identity intentions to anyone else. Accepting the challenge and telling about it only to his closest friend, Arul arrives in Chennai and as time passes, he forms a strong bind with other beggars in the city. He even comes close to Magizhini, a lady who runs a pizza parlour due to her good nature. Everything goes smooth until the day when he gets caught between deadly goons and his uncle who finds out about him and tries to overtake his business.