Half Girlfriend is one of the best story I have read in my life. I have read all the stories of Chetan Bhagat and I think this is his one of the best written story. This story contains friendship, love, relationship between a son and a mother, relationship between two friends, widely description of two different cultures of society and many other things.
If you want to know that things and if you want to read a very good story book then you must have to read "Half Girlfriend". I am giving you the guarantee that if you read the book then your precious time will not be wasted.