>>2391821Yes, Sae and Hiro graduated so they obviously had to move away too, so there's room for a new girl. Ume probably wants to focus on Yuno's senior year so that's why there's just one new girl.
There's a Graduation OVA for it too if you don't want to read the manga. You should though because it's great. I think the manga develops their final year better than the anime, or at least it didn't feel as sudden, and there are a few chapters after the graduation that are really good too.
