My Wife Has No Emotion

The story starts with a single guy, Takuma who is living a boring life all alone. He went to work and then came back but he needed someone to take care of him and do things for him. For that, he decided to buy a robot ”Mina-Chan” who can cook and even do housework. One day, Takuma said in fun that she should have become his wife and that the robot takes it seriously. Then this relationship started to proceed and they went out on vacation and picnics together. When the time passes Takuma has feelings for Mina but she is just a Robot, how can be they equal?