En Thangachi Padichava (English: My younger sister is literate) is a 1988 Tamil drama film directed by P. Vasu. The film features Prabhu, Rupini and Chithra in lead roles. The film, produced by Mohan Natarajan and Tharangai V. Shanmugam, had musical score by Gangai Amaran and was released on 15 July 1988. The film completed a 100-day run at the box-office. It was one of the blockbuster hit of the year and prompted further collaborations between Prabhu and P. Vasu. It was remade in Hindi as Aaj Ka Arjun starring Amitabh Bachchan, in Kannada as Ravimama starring V. Ravichandran and in Telugu as Muddula Mavayya starring Balakrishna.
Dhanakodi (Nassar), an honest police officer, is transferred to a small village. In this village, Karunakaran (Kitty), a rich landlords, spreads terror among the villagers and threatens them to give their lands. After spending five years in jail for a murder, Periasamy (Prabhu) is back to his village. Dhanakodi wants to trap the heartless Karunakaran at any cost.
In the past, Periasamy was an orphan who lived with his only sister Lakshmi. Lakshmi, after finishing her studies in the city, came back to her village. Periasamy and Valli (Rupini) were in love. She still against Karunakaran's conspiracy. Lakshmi and Karunakaran's son Chinnaiah fell in love each other and got married with Periasamy's support. Chinnaiah went missing while Lakshmi became pregnant. Lakshmi found out that Chinnaiah was in his father's house and it was Karunakaran's master plan. Periasamy went there but he was humiliated by Karunakaran. In the meantime, Chinnaiah stabbed Lakshmi but Lakshmi gave birth before dying. The angry Periasamy killed Chinnaiah. What transpires later forms the crux of the story.
Prabhu as Periasamy
Rupini as Valli
Chithra as Lakshmi
Nassar as Dhanakodi
Kitty as Karunakaran
Mohan Natarajan as Manikkam
Ravikiran as Chinnaiah
Anandaraj as Gaja
The film's shooting was held in Pollachi. It was P. Vasu's first solo direction in Tamil.
The film score and the soundtrack were composed by film composer Gangai Amaran. The soundtrack, released in 1988, features 6 tracks with lyrics written by Gangai Amaran.