Kaala Koothu Tamil Movie Online HD, The film opens with a new boy (Prasanna’s childhood character) joining in the class of Hari (Kalaiarasan’s childhood character) and he is instantly disliked because of his withdrawn nature. Hari picks a fight with him and he breaks his nose and brings his parents to school. The mother of Hari however on coming to know that the boy is an orphan tells him that she can consider him as his mother. However in a few days time she too dies and in the funeral the orphan holds his hand and consoles him. Years later Kalaiarasan is in a long time relationship with college girl (!!!) Sai Dhansika while a demure Shruste Dange pines for Prasanna who ignores her as he fears that something bad will happen to her too. The heroes make a dangerous enemy in the form of a local mayor’s son who they beat up and break his hands for harassing Kalaiarasan’s sister. Meanwhile Prasanna accepts Shruste due to Kalai’s efforts and just when everything seems to be going well tragedy strikes at both ends and what happens next forms the rest of the screenplay.