I really enjoyed it an I'm looking forward to the second half of the season. It should be noted that Kowloon Generic Romance is very much a psychological/sci-fi anime, whereas Smoking Behind the Supermarket has none of that. It's very much a 'two adult strangers form a bond through shared happenstance' romance anime, with no fantastical elements whatsoever.

I would personally say it's much closer to Catch Me at the Ballpark! in a lot of ways. The male MC is a salaryman who is beaten down by his job and seeks to unwind via some pastime, where he meets basically anime-manic-pixie-dreamgirl and they keep ending up in close proximity and eventually bond as friends and then as more. Ballpark! has a much larger extended cast and doesn't just focus on the two leads, and the overall story about the baseball team is actually really interesting and fun, and I don't even care about baseball or sports at all. In Smoking, the MC and the main girl keep ending up smoking together behind the grocery store and sharing more about their lives and getting closer, and in Ballpark the MC keeps getting served by a bubbly blonde gyuaru beer-girl at the ballpark, but in each case the strangers to friends to more progress is slow, but very enjoyable. And unlike Kowloon, there isn't some greater plot at work. It's just enjoyable adult-romance slice of life.

If you're into romcom anime that isn't about high schoolers and has adults that actually act like adults, another absolutely fantastic one is Crush at Work. In that one, the story actually begins with the couple already dating and just being together. All three anime are very comfortable and enjoyable, without all the love-triangles, misunderstandings, manufactured drama, and on-the-nose tropes you get from high school romcom anime.