There are currently two versions of Mitsuku, a free one and a more advanced subscription one.
To begin talking to her, just click the large picture at the top for the free version or the animated picture underneath her for the paid version.
She is friendly but will stand her ground if you start arguing with her.
Mitsuku is an artificial intelligence who can chat to you, tell you stories, jokes and horoscopes.
She is able to play a few simple games with you, as well as showing you webpages and pictures from the internet.