Hi everyone!
This manga had a nostalgic feel to it.
It's basically about this little boy that moves to the countryside I think, and he meets a girl with the most beautiful singing voice. They would often go out in the forest, and legit everything just stopped when this little girl sang. I don't remember much, but I remember this girl was living with a grandparent, who was really protective of her because of what happened to the little girl's mother. I think the mother also had a beautiful voice and was exploited by some record producer.
I remember something about butterflies in this manga.

It should be Chinatsu no Uta.

Thank you a million!!!!