I finished this one quite a while ago as well and I really enjoyed it.
Kono oto Tomare is about a school's koto club (a traditional musical instrument) and the members, who each have their own challenges. It's a slice of life type of thing, but with some romantic elements.
That said, the three characters in the forefront of the picture are the main characters.
There's Chika (the blonde). His grandfather was a koto maker and he was a bit of a juvenile delinquent (but with a good heart). Some ruffians basically trashed his grandfather's store, pinning it on him, and his grandfather died soon after, so poor Chika has a heavy burden on his heart. His exterior is rough and tough, but he's a marshmallow inside. He joins the club because of his connection with his grandfather and his yearning to be a better person (not that he realises that part).
The dark haired girl is Satowa, who was a koto prodigy and daughter of a grandmaster (or whatever you'd call it) of a koto school. But her father died and her mother pushed her away to the point that now she lives on her own and has been disowned. She joins the club in hopes to rekindle her love of the koto, in part, but also to find herself again.
The dark haired guy in glasses is the sole member of the club after the rest graduated. He's Takezo Kurata. His baggage isn't as heavy as Chika and Satowa, but he's got some too -- the pressure of keeping the club alive, being put down by school bullies & his own brother, and general feelings of inadequacy. That said, he's a stand up guy.
The other boys are all friends of Chika's that believe in him even when no one else did because he helped them out even when he didn't have to. Weirdly, his closest friend isn't a member of the club, but we see him a lot in the show (Tetsuki). The other girl is in the same year as Kurata and at first joins the club with the intention of breaking it up but winds up finding a place for herself. There's some hints of romance beween her and Kurata by the end of the second season and Chika and Satowa are also headed that route.
However, it's not really a romance anime. It's more of a found family / overcoming adversity / learning to believe in yourself & others, etc. etc. The story is good, the characters are good (even the three guys have distinct personalities beyond just caricature), the art is good, the koto playing is well done...really, it's an all around good show.
Definitely glad I watched it. Would watch it again someday too. If they ever did another season, I'd watch it (though that seems unlikely since it came out in 2019). I'm not sure that I'll buy it to read it, but mostly just because I've already got so many different series going. Well worth it though.