A bestselling contemporary romance novel by Chetan Bhagat. The story follows Madhav Jha, a boy from rural Bihar, who gains admission to a prestigious college in Delhi. There he meets Riya Somani, a wealthy and sophisticated girl from an entirely different background. As their friendship deepens, Madhav struggles to define their relationship, leading to the idea of being a "half girlfriend." The novel explores love, friendship, ambition, social class differences, and the challenges of communication in relationships.