Regarding Divorce procedure

My friends brother got married on May 25th 2017 in front of relatives from both the parties but the wife only stayed with the boy's family for 2 days and no intercourse happened between the couple. The girl says that she doesn't like the boy and she doesn't want to stay with him or his family at all. They are blaming that the boy wanted to indulge in sexual activity with the girl against her will and that the boy is mentally not well. However, the boy is completely normal and it is suspected that the girl has an affair with someone else and she did all that on purpose so that she could get divorce later to stay with the person she loves. It was all planned because the same girl said Yes for the same boy before they got married and on the very first day she started complaining and she left her in law's house on the second day. Now both the families want to get rid of each other considering it a big mistake of their lives. So, please suggest how they should get divorced? And can they get divorced from notary for now and later they can apply for divorce in the court, so that the girl's family cannot harass the boy's family for money or other benefits?