I know everybody's heartbroken, I get it, but honestly, I'm just so relieved Kaori got the end of the story and responded to it. Shizuku kept putting it off, and I was desperately afraid she was going to wait too long. It's always hard losing somebody, but to have a promise like that sitting unfinished can really break a person. It would have made this story so much more tragic.
Chapter 3 seems to only have the first page. When you get to chapter 4 the story has clearly moved forward, so this doesn't seem intentional.