Shiawase Ikura de Kaemasu ka? How Much is Happiness?

Synopsis

When she was young, her parents died in a car accident. Her only relative, her grandma, has also passed way. At such, Kiri is now alone and without support. On the day of her grandma's funeral, an unknown young man named "Shiina" appeared before her. The truth was, her grandma had been funding this violinist...? (Source: Shoujo Crusade)