I finished subbing this a few days ago because I wouldn't let my friends watch bad AI subs, lol. I won't post the video links here directly but I'll leave the link of where you can find them in a comment if you guys are interested.
I'm not sure if they adress it, but someone mentioning a 6 year age gap; 11 and 17 in the past, 21 and 27 in the…
That's incorrect. Hiro says he's in 8th grade which would make him 14 years old. Kai being 11 seems accurate, though. He looks about 15 when he starts working at the restaurant, so 6 years later would make him 21, and Hiro 24. So it's probably a 3-year age gap.
I would 100% watch a second season of this.