Based off of the fact you said she played violin. Ima guess Your Lie in April. I never formally watched this anime either but if I remember the girl also did play Violin.
Also I am mostly not watching it due to the fact that I don't really think I can handle much after Clannad or Anohana lol.
The manga is kinda strange. Its a lot different from all the other harems I have watched/read.
Each girl has their own unique "ending." The story ends off with different branching paths in a sense. So there is one for every single one, yes even the teacher.
A 6th ending was added but it was a supposed "harem" ending.
So I guess I can start the guessing game right. Well, I guess I could go with a relatively obscure character.
- High school female. Not the main character.
- Relatively shy
- Can craft beautiful japanese candy, but can't make them taste good.
- Involved with a key and locket.
edit: I now realize this is not really an obscure character.
I don't really know what anime is being described here. My guess is maybe K-on even though I never watched the show. I'm just going off of the little bits and clips I have seen.
Well. I ended up choosing Parasyte since I somehow didn't see Re:Zero lmao. Well other then that, I guess Mirai Nikki is another interesting one to go into. I definitely would not say Mirai Nikki is better than Parasyte or Re:Zero, but it is an anime that is interesting to get into if you have nothing else to watch. The story is chaos but I don't think that is really a bad thing. (Unless of course you have already watched it.)
(Though now that I think about it, I only ended up getting into Mirai Nikki because I really liked the first opening.)
Eeeeeey, Bokutachi wa Benkyou Shiranai. I think the manga just ended recently. I haven't read too many mangas aside from Nisekoi, OPM, Please Don't Bully Me Nagataro, Komi-san can't communicate, We Never Learn, and a few others.