I feel like this story really needs to touch more on the relationship between the old man and the high schooler for it to feel satisfying. Not necessarily in a romantic way, just a resolution to her arc. We didn't even see a mention of her past chapter 4/5 beyond her grieving the beer's death...
Correction: Chapter 19 is missing. The current chapter 19 is chapter 18. The second chapter 26 is chapter 30. Beyond this I believe everything else is in the correct spot.
Chapter 19 is chapter 18, the group messed up the numbering, like they uploaded the chapters without bothering to make sure they were correct. After chapter 26, the following chapters are all out of order and some are repeated.