Vaigasi Poranthachu is a 1990 Tamil drama film directed by Radha Bharathi. The film features Prashanth and Kaveri in lead roles. The film, produced by K. Prabakaran, had musical score by Deva and was released on 16 November 1990. The film marked the debut of Thiagarajan's son Prashanth. It was a commercial success. The film was remade in Hindi as I Love You starring Prashanth, reprising his role from the original, and Sabah.
Kumaresan (Prashanth) belongs to a poor Hindu family living with his mother Lakshmi (Sulakshana) & his grandmother (Kala). Kumaresan is a brilliant student but naughty at school. Along with his friends he teases Ranjitha (Kavery - debut) the daughter of Pandidhurai (K.Prabakaran) the village head. Few months later, attracted by Kumaresan’s wits & pranks Ranjitha falls in love with him.
Pandidhurai becomes insane knowing his daughter’s love affair. His henchmen lock Kumaresan up, in Pandidhurai’s house & lash him with whip. Not able to stand this savage treatment on Kumaresan Ranjitha swoons. Ranjitha’s mother Parvathi (K. R. Vijaya) helps her daughter to elope with Kumaresan. A massive hunt is launched by the village head & what happened to the young lovers is the rest of the story….