Hana mo Arashi mo (https://www.mangaupdates.com/series.html?id=103236) is kinda like a sequel or spin-off to this manga. Though I have read both of the manga, I'm still confused. It's like both of the manga end in a cliffhanger. I wish there will be another sequel or spin-off with an ending that is not rush and makes sense.
Tsuki No Shizumu Made