When Alto is a kid, he becomes attached to the nearest Kannagi and starts serving him even though everyone else in the village is afraid. Over time, the curse on the Kannagi appears to be lifting, and the two start to fall in love. At the same time, they try to uncover the secret of their island, why the Kannagi are left to die young, why the black sea is such a dangerous force, etc.
Yoake no Uta