Boku no Tsuma wa Kanjou ga Nai

Takuma is a single guy who lives alone in his house and has a boring office life. After coming back from the office he got tired and had no one who do house stuff for him. For that one day, he decided to purchase a robot, Mina-Chan. She can cook and also do all the housework for Takuma and on day as a joke he said she should become his wife. She took this joke seriously and then she slowly adopted the habits like a wife and they went for picnics and various other things. Takuma has feelings for Mina but how can a human and a robot be equal in a relationship?