Astitva is a bold film with adultery. An ambitious male chauvinist and his loving wife are happily married but the guy is not able to give time to the family as he want to make it big in life. His work is of paramount importance to him. His work keeps him away from his home for days and this makes the wife very lonely. In one such instance, she succumbs to loneliness and has a physical relationship with her music teacher and becomes pregnant. She tries confessing to her husband, but he is so excited about her pregnancy, that he does not listen to her story. Twenty Five years later, circumstances force the suspicious husband's mind to work overtime and confronts his wife with facts and figures that when she was pregnant, he had not had any physical relationship with her for more than 9 months before the child's birth. Then whose child is it? The wife accepts it and ask for forgiveness...