What a sad ending. Satou confesses, but Kisaragi-san feels it's not time. That's ok, but the fact she asks to be friends is a bit hurtful. Satou has had feelings for her for a long time, and he's the one who pursued her. Yet she felt the need to ask him to be her friend, despite how close they became, and how many things they did together. Now that's just painful. But Satou was understanding of that, at least. They were willing to get to dating, but not immediately.
I wish this had a better ending, the previous chapters were already ok. This is a sudden jarring shift in direction. Man, I hope this gets a continuation someday. 17 chapters is not enough.