Well, I think this anime will follow up Rin’s 2nd route because in VN, in order to acquire that route you need to complete the other character routes including the 1st Rin route. You can refer here. (Warning: minor spoilers) So I assume that they’ll include all character routes in this anime. I hope they will animate Refrain route soon.
Next episode will be the introduction of Yuiko & maybe Haruka. Kud might be after that following by Mio.