'Azhai Osai' is a novel written by Kalki Krishnamoorthy (pseudonym of R. Krishnamurthy), one of Tamil literature's most celebrated writers. Kalki is known for historical and social novels including 'Ponniyin Selvan' and 'Sivagamiyin Sabatham.' Charu Niveditha, Jeya Mohan, and Vasanthi are also Tamil authors, but 'Azhai Osai' is specifically Kalki's work examining social themes and human relationships.