
Yeah I’ve read vol. 1. It has a lot of angst from what I remember. I’ve read it a long time ago so I can’t remember much. All I can remember was that they had issues with their families, right? Or is it a different manga hahahaha. Have you read Life no Senjou? I can’t forget the feeling I’ve had after reading it. It was bittersweet. It also has a drama cd.

It starts with "ten years ago" and Subaru says he'll be coming to Japan for college (meaning he'd be about eighteen), so he was probably about eight when they met.
Tatsumi says he's been a writer since some time in high school and is a working adult when he meets Subaru, so he's at least eighteen, though probably older. Meaning they are at least ten years apart.
How far are they apart? In terms of age.