武神伝　生贄に捧げられた俺は、神に拾われ武を極める (Associated Names)

Since his childhood, Touma Godou has been unable to use magic, and as a result, he was despised and treated as incompetent by his own father. As a result, he was sacrificed on the island of Kyokuma. Where wild demons roam. But there he meets a demigod who helps him master the art of combat…