Hate Plus, which is coming on August 19th of this year, takes place directly after the events of the previous game. This time, the focus is on AI companion *Mute. You will also be "uncovering the mystery of year zero on the Mugunghwa."
Save files can be imported from Analogue: A Hate Story, or you may start fresh (though it's heavily recommended that you play the first game before starting this one!).