This is cute and filled with a lot of emotions, with each episode they touch on topics of heartbreak, love, jealousy, self-love, friendship, and family, Now, I would recommend watching if you're looking for a Japanese bl that has that soft melodrama romance with some funny scenes in between filled with all sorts of emotions with a teen and an adult at the center of it all.

The age cap is alright and pretty much valid from Minato's perspective, for reasons I will explain:
Majority of the show (mostly in the beginning cause this is still ongoing) Minato is very reluctant to show any emotions towards Shin regardless of how he feels when he's with him. Minato is more mature and an adult, who's outgrown his teens and is going through that self-acceptance stage in his life after overcoming his past. He's well aware that his actions will have repercussions he'll have to face and live with for the rest of his life and as such he is very cautious with the choices he makes.

(Take my word for it your going to fall in love with Shin's death stare) Shin is super charming yet aggressive at times and somewhat overly protective with his love for Minato-San. I do think Shin will at least wait another year before anything too serious he's still a high schooler after all. Minato-san is not overly dramatic but has super high gay panic with Shin that will make you smile at your computer screen like crazy.

The storyline is short and cute with sad moments here and there. We get to see both Shin and Minato's stories and Minato-san's past with his sensei. Shin's friendship with Asuka is super adorable and their bickering is not overbearing it's cute. Asuka is so precious we also get to see his side story too.

I think you should give it a watch, it's going to make your heart flutter, and who knows this might be the cutest Japanese bl you watch this year.