しまなみ誰そ彼
You’re right that it feels like we’re getting just a little peek into the lives of the characters, that’s a nice way of viewing it! And I agree that Tsubaki’s plotline felt like it got resolved a bit too abruptly (but I was glad that it got resolved).
Thanks for sharing your thoughts on the series! I’m happy to hear you enjoyed it too! 
There was a book club for volume 1 a few months back (with a few more recent comments about the ending), so you can see some other people’s thoughts on it if you’re curious! Here