Whelp, I was coming to drop the warning, but I see all my fellows readers have already done so.
Although it's actually not chapter 13, but chapter 15.
Okay, here's dem apples.
Og story was pretty okay. 0 development, but hey, for a friggin' 4-koma comedy/romance (not romance/comedy, no; comedy/romance) that was more or less expected. It was okay.
Then there's this sequel. If you expected something like "tiny senpai" where the sequel is them married and living together or something...perish the thought. It's exactly the same as original. I guess it was divided cause editorial issues or something.
There IS some minimal progress that I won't go into detail cause spoilers, but...really not even worth discussing.
So, for the first 15 chapters this sequel is just about the same as og story. And then chapter 16 happens. Author suffers a stroke or something and decides it's a good idea to add characters that have LITERALLY no other reason for existing than adding useless, and even more, STUPID drama. And what I mean by that is that it's not even "drama", cause we continue with the 4-koma comedy premise. It's just annoying. VERY annoying.
So you have 3 options.
1) Skip this altogether. It's fine, really.
2) Read until chapter 15, included. If you liked the original, you'll like this, generally speaking.
3) If you wanna risk it, read until chapter 15, then read chapter 31 but ONLY pages 17, 18 and 19 (the last 3). You can risk page 16, but it's slightly annoying too.
And then there's option 4), I guess. Read everything? But really, why would you do that? It's a terrible, terrible idea.