In the early years of Japan's Meiji Restoration, a human ronin must unite with an orc assassin to save an elf orphan from their common adversary.

Kousei Arima was a genius pianist until his mother's sudden death took away his ability to play. Each day was dull for Kousei. But, then he meets a violinist named Kaori Miyazono who has an eccentric playing style. Can the heartfelt sounds of the girl's violin lead the boy to play the piano again?