Half Grilfriend is a book written by Chetan Bhagat. The book covers the love story of Madhav & Riya, 2 people from completely different backgrounds. Madhav is a indigenous man whereas Riya is from a rich Marwarifamily.Though they're completely different from each other, there is somthing which links them together. Madhav wants a relationship with Riya, still, Riya wanted them to be musketeers. They eventually came to a conclusion. Riya could be Madhav's Half-Grilfriend.